From 14560c1dfa04c063540aa28c692b7e5fbdd511d6 Mon Sep 17 00:00:00 2001
From: JoseVelazquezR <jose.velazquez.r@outlook.com>
Date: Thu, 24 Mar 2022 01:32:14 -0600
Subject: [PATCH 1/2] lab terminado

---
 .../challenge-1-checkpoint.ipynb              | 1016 +++++++++++++++++
 .../challenge-2-checkpoint.ipynb              |  197 +++-
 your-code/challenge-1.ipynb                   |  816 ++++++++++++-
 your-code/challenge-2.ipynb                   |  197 +++-
 4 files changed, 2161 insertions(+), 65 deletions(-)
 create mode 100644 your-code/.ipynb_checkpoints/challenge-1-checkpoint.ipynb

diff --git a/your-code/.ipynb_checkpoints/challenge-1-checkpoint.ipynb b/your-code/.ipynb_checkpoints/challenge-1-checkpoint.ipynb
new file mode 100644
index 0000000..0859d23
--- /dev/null
+++ b/your-code/.ipynb_checkpoints/challenge-1-checkpoint.ipynb
@@ -0,0 +1,1016 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# String Operations Lab\n",
+    "\n",
+    "**Before your start:**\n",
+    "\n",
+    "- Read the README.md file\n",
+    "- Comment as much as you can and use the resources in the README.md file\n",
+    "- Happy learning!"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import re"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Challenge 1 - Combining Strings\n",
+    "\n",
+    "Combining strings is an important skill to acquire. There are multiple ways of combining strings in Python, as well as combining strings with variables. We will explore this in the first challenge. In the cell below, combine the strings in the list and add spaces between the strings (do not add a space after the last string). Insert a period after the last string."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "'Durante un tiempo no estuvo segura de si su marido era su marido.'"
+      ]
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "str_list = ['Durante', 'un', 'tiempo', 'no', 'estuvo', 'segura', 'de', 'si', 'su', 'marido', 'era', 'su', 'marido']\n",
+    "# Your code here:\n",
+    "\" \".join(str_list) + \".\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "In the cell below, use the list of strings to create a grocery list. Start the list with the string `Grocery list: ` and include a comma and a space between each item except for the last one. Include a period at the end. Only include foods in the list that start with the letter 'b' and ensure all foods are lower case."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 24,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['bananas',\n",
+       " 'chocolate',\n",
+       " 'bread',\n",
+       " 'diapers',\n",
+       " 'ice cream',\n",
+       " 'brownie mix',\n",
+       " 'broccoli']"
+      ]
+     },
+     "execution_count": 24,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "food_list = ['Bananas', 'Chocolate', 'bread', 'diapers', 'Ice Cream', 'Brownie Mix', 'broccoli']\n",
+    "# Your code here:\n",
+    "# convertir lista original a nueva lista solo con minusculas\n",
+    "grocery_list = [i.lower() for i in food_list]\n",
+    "grocery_list"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 77,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "'bananas chocolate bread diapers ice cream brownie mix broccoli'"
+      ]
+     },
+     "execution_count": 77,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "# convertir lista en string único\n",
+    "a = \" \".join(grocery_list)\n",
+    "a"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 31,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['bananas', 'bread', 'brownie', 'broccoli']"
+      ]
+     },
+     "execution_count": 31,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "# obtener sólo las palabras que empiezan por b\n",
+    "b = re.findall(r\"b.+?\\b\", a)\n",
+    "b"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 33,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "'bananas, bread, brownie, broccoli.'"
+      ]
+     },
+     "execution_count": 33,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "# unir palabras obtenidas\n",
+    "\", \".join(b) + \".\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "In the cell below, write a function that computes the area of a circle using its radius. Compute the area of the circle and insert the radius and the area between the two strings. Make sure to include spaces between the variable and the strings. \n",
+    "\n",
+    "Note: You can use the techniques we have learned so far or use f-strings. F-strings allow us to embed code inside strings. You can read more about f-strings [here](https://www.python.org/dev/peps/pep-0498/)."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 35,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "78.53981633974483"
+      ]
+     },
+     "execution_count": 35,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "import math\n",
+    "pi = math.pi\n",
+    "circle_area = pi*(5**2)\n",
+    "circle_area"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 40,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The area of the circle with radius: 5 is: 78.53981633974483\n"
+     ]
+    }
+   ],
+   "source": [
+    "import math\n",
+    "\n",
+    "string1 = \"The area of the circle with radius:\"\n",
+    "string2  = \"is:\"\n",
+    "radius = 4.5\n",
+    "\n",
+    "def area(x, pi = math.pi):\n",
+    "    # This function takes a radius and returns the area of a circle. We also pass a default value for pi.\n",
+    "    # Input: Float (and default value for pi)\n",
+    "    circle_area = pi*(x**2)\n",
+    "    # Output: Float\n",
+    "    return print(f\"{string1} {x} {string2} {circle_area}\")\n",
+    "        \n",
+    "# Your code here:    \n",
+    "# Sample input: 5.0\n",
+    "# Sample Output: 78.53981633\n",
+    "area(5)\n",
+    "# Your output string here:"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Challenge 2 - Splitting Strings\n",
+    "\n",
+    "We have first looked at combining strings into one long string. There are times where we need to do the opposite and split the string into smaller components for further analysis. \n",
+    "\n",
+    "In the cell below, split the string into a list of strings using the space delimiter. Count the frequency of each word in the string in a dictionary. Strip the periods, line breaks and commas from the text. Make sure to remove empty strings from your dictionary."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 41,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "poem = \"\"\"Some say the world will end in fire,\n",
+    "Some say in ice.\n",
+    "From what I’ve tasted of desire\n",
+    "I hold with those who favor fire.\n",
+    "But if it had to perish twice,\n",
+    "I think I know enough of hate\n",
+    "To say that for destruction ice\n",
+    "Is also great\n",
+    "And would suffice.\"\"\"\n",
+    "\n",
+    "# Your code here:\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 42,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Help on module re:\n",
+      "\n",
+      "NAME\n",
+      "    re - Support for regular expressions (RE).\n",
+      "\n",
+      "MODULE REFERENCE\n",
+      "    https://docs.python.org/3.10/library/re.html\n",
+      "    \n",
+      "    The following documentation is automatically generated from the Python\n",
+      "    source files.  It may be incomplete, incorrect or include features that\n",
+      "    are considered implementation detail and may vary between Python\n",
+      "    implementations.  When in doubt, consult the module reference at the\n",
+      "    location listed above.\n",
+      "\n",
+      "DESCRIPTION\n",
+      "    This module provides regular expression matching operations similar to\n",
+      "    those found in Perl.  It supports both 8-bit and Unicode strings; both\n",
+      "    the pattern and the strings being processed can contain null bytes and\n",
+      "    characters outside the US ASCII range.\n",
+      "    \n",
+      "    Regular expressions can contain both special and ordinary characters.\n",
+      "    Most ordinary characters, like \"A\", \"a\", or \"0\", are the simplest\n",
+      "    regular expressions; they simply match themselves.  You can\n",
+      "    concatenate ordinary characters, so last matches the string 'last'.\n",
+      "    \n",
+      "    The special characters are:\n",
+      "        \".\"      Matches any character except a newline.\n",
+      "        \"^\"      Matches the start of the string.\n",
+      "        \"$\"      Matches the end of the string or just before the newline at\n",
+      "                 the end of the string.\n",
+      "        \"*\"      Matches 0 or more (greedy) repetitions of the preceding RE.\n",
+      "                 Greedy means that it will match as many repetitions as possible.\n",
+      "        \"+\"      Matches 1 or more (greedy) repetitions of the preceding RE.\n",
+      "        \"?\"      Matches 0 or 1 (greedy) of the preceding RE.\n",
+      "        *?,+?,?? Non-greedy versions of the previous three special characters.\n",
+      "        {m,n}    Matches from m to n repetitions of the preceding RE.\n",
+      "        {m,n}?   Non-greedy version of the above.\n",
+      "        \"\\\\\"     Either escapes special characters or signals a special sequence.\n",
+      "        []       Indicates a set of characters.\n",
+      "                 A \"^\" as the first character indicates a complementing set.\n",
+      "        \"|\"      A|B, creates an RE that will match either A or B.\n",
+      "        (...)    Matches the RE inside the parentheses.\n",
+      "                 The contents can be retrieved or matched later in the string.\n",
+      "        (?aiLmsux) The letters set the corresponding flags defined below.\n",
+      "        (?:...)  Non-grouping version of regular parentheses.\n",
+      "        (?P<name>...) The substring matched by the group is accessible by name.\n",
+      "        (?P=name)     Matches the text matched earlier by the group named name.\n",
+      "        (?#...)  A comment; ignored.\n",
+      "        (?=...)  Matches if ... matches next, but doesn't consume the string.\n",
+      "        (?!...)  Matches if ... doesn't match next.\n",
+      "        (?<=...) Matches if preceded by ... (must be fixed length).\n",
+      "        (?<!...) Matches if not preceded by ... (must be fixed length).\n",
+      "        (?(id/name)yes|no) Matches yes pattern if the group with id/name matched,\n",
+      "                           the (optional) no pattern otherwise.\n",
+      "    \n",
+      "    The special sequences consist of \"\\\\\" and a character from the list\n",
+      "    below.  If the ordinary character is not on the list, then the\n",
+      "    resulting RE will match the second character.\n",
+      "        \\number  Matches the contents of the group of the same number.\n",
+      "        \\A       Matches only at the start of the string.\n",
+      "        \\Z       Matches only at the end of the string.\n",
+      "        \\b       Matches the empty string, but only at the start or end of a word.\n",
+      "        \\B       Matches the empty string, but not at the start or end of a word.\n",
+      "        \\d       Matches any decimal digit; equivalent to the set [0-9] in\n",
+      "                 bytes patterns or string patterns with the ASCII flag.\n",
+      "                 In string patterns without the ASCII flag, it will match the whole\n",
+      "                 range of Unicode digits.\n",
+      "        \\D       Matches any non-digit character; equivalent to [^\\d].\n",
+      "        \\s       Matches any whitespace character; equivalent to [ \\t\\n\\r\\f\\v] in\n",
+      "                 bytes patterns or string patterns with the ASCII flag.\n",
+      "                 In string patterns without the ASCII flag, it will match the whole\n",
+      "                 range of Unicode whitespace characters.\n",
+      "        \\S       Matches any non-whitespace character; equivalent to [^\\s].\n",
+      "        \\w       Matches any alphanumeric character; equivalent to [a-zA-Z0-9_]\n",
+      "                 in bytes patterns or string patterns with the ASCII flag.\n",
+      "                 In string patterns without the ASCII flag, it will match the\n",
+      "                 range of Unicode alphanumeric characters (letters plus digits\n",
+      "                 plus underscore).\n",
+      "                 With LOCALE, it will match the set [0-9_] plus characters defined\n",
+      "                 as letters for the current locale.\n",
+      "        \\W       Matches the complement of \\w.\n",
+      "        \\\\       Matches a literal backslash.\n",
+      "    \n",
+      "    This module exports the following functions:\n",
+      "        match     Match a regular expression pattern to the beginning of a string.\n",
+      "        fullmatch Match a regular expression pattern to all of a string.\n",
+      "        search    Search a string for the presence of a pattern.\n",
+      "        sub       Substitute occurrences of a pattern found in a string.\n",
+      "        subn      Same as sub, but also return the number of substitutions made.\n",
+      "        split     Split a string by the occurrences of a pattern.\n",
+      "        findall   Find all occurrences of a pattern in a string.\n",
+      "        finditer  Return an iterator yielding a Match object for each match.\n",
+      "        compile   Compile a pattern into a Pattern object.\n",
+      "        purge     Clear the regular expression cache.\n",
+      "        escape    Backslash all non-alphanumerics in a string.\n",
+      "    \n",
+      "    Each function other than purge and escape can take an optional 'flags' argument\n",
+      "    consisting of one or more of the following module constants, joined by \"|\".\n",
+      "    A, L, and U are mutually exclusive.\n",
+      "        A  ASCII       For string patterns, make \\w, \\W, \\b, \\B, \\d, \\D\n",
+      "                       match the corresponding ASCII character categories\n",
+      "                       (rather than the whole Unicode categories, which is the\n",
+      "                       default).\n",
+      "                       For bytes patterns, this flag is the only available\n",
+      "                       behaviour and needn't be specified.\n",
+      "        I  IGNORECASE  Perform case-insensitive matching.\n",
+      "        L  LOCALE      Make \\w, \\W, \\b, \\B, dependent on the current locale.\n",
+      "        M  MULTILINE   \"^\" matches the beginning of lines (after a newline)\n",
+      "                       as well as the string.\n",
+      "                       \"$\" matches the end of lines (before a newline) as well\n",
+      "                       as the end of the string.\n",
+      "        S  DOTALL      \".\" matches any character at all, including the newline.\n",
+      "        X  VERBOSE     Ignore whitespace and comments for nicer looking RE's.\n",
+      "        U  UNICODE     For compatibility only. Ignored for string patterns (it\n",
+      "                       is the default), and forbidden for bytes patterns.\n",
+      "    \n",
+      "    This module also defines an exception 'error'.\n",
+      "\n",
+      "CLASSES\n",
+      "    builtins.Exception(builtins.BaseException)\n",
+      "        error\n",
+      "    builtins.object\n",
+      "        Match\n",
+      "        Pattern\n",
+      "    \n",
+      "    class Match(builtins.object)\n",
+      "     |  The result of re.match() and re.search().\n",
+      "     |  Match objects always have a boolean value of True.\n",
+      "     |  \n",
+      "     |  Methods defined here:\n",
+      "     |  \n",
+      "     |  __copy__(self, /)\n",
+      "     |  \n",
+      "     |  __deepcopy__(self, memo, /)\n",
+      "     |  \n",
+      "     |  __getitem__(self, key, /)\n",
+      "     |      Return self[key].\n",
+      "     |  \n",
+      "     |  __repr__(self, /)\n",
+      "     |      Return repr(self).\n",
+      "     |  \n",
+      "     |  end(self, group=0, /)\n",
+      "     |      Return index of the end of the substring matched by group.\n",
+      "     |  \n",
+      "     |  expand(self, /, template)\n",
+      "     |      Return the string obtained by doing backslash substitution on the string template, as done by the sub() method.\n",
+      "     |  \n",
+      "     |  group(...)\n",
+      "     |      group([group1, ...]) -> str or tuple.\n",
+      "     |      Return subgroup(s) of the match by indices or names.\n",
+      "     |      For 0 returns the entire match.\n",
+      "     |  \n",
+      "     |  groupdict(self, /, default=None)\n",
+      "     |      Return a dictionary containing all the named subgroups of the match, keyed by the subgroup name.\n",
+      "     |      \n",
+      "     |      default\n",
+      "     |        Is used for groups that did not participate in the match.\n",
+      "     |  \n",
+      "     |  groups(self, /, default=None)\n",
+      "     |      Return a tuple containing all the subgroups of the match, from 1.\n",
+      "     |      \n",
+      "     |      default\n",
+      "     |        Is used for groups that did not participate in the match.\n",
+      "     |  \n",
+      "     |  span(self, group=0, /)\n",
+      "     |      For match object m, return the 2-tuple (m.start(group), m.end(group)).\n",
+      "     |  \n",
+      "     |  start(self, group=0, /)\n",
+      "     |      Return index of the start of the substring matched by group.\n",
+      "     |  \n",
+      "     |  ----------------------------------------------------------------------\n",
+      "     |  Class methods defined here:\n",
+      "     |  \n",
+      "     |  __class_getitem__(...) from builtins.type\n",
+      "     |      See PEP 585\n",
+      "     |  \n",
+      "     |  ----------------------------------------------------------------------\n",
+      "     |  Data descriptors defined here:\n",
+      "     |  \n",
+      "     |  endpos\n",
+      "     |      The index into the string beyond which the RE engine will not go.\n",
+      "     |  \n",
+      "     |  lastgroup\n",
+      "     |      The name of the last matched capturing group.\n",
+      "     |  \n",
+      "     |  lastindex\n",
+      "     |      The integer index of the last matched capturing group.\n",
+      "     |  \n",
+      "     |  pos\n",
+      "     |      The index into the string at which the RE engine started looking for a match.\n",
+      "     |  \n",
+      "     |  re\n",
+      "     |      The regular expression object.\n",
+      "     |  \n",
+      "     |  regs\n",
+      "     |  \n",
+      "     |  string\n",
+      "     |      The string passed to match() or search().\n",
+      "    \n",
+      "    class Pattern(builtins.object)\n",
+      "     |  Compiled regular expression object.\n",
+      "     |  \n",
+      "     |  Methods defined here:\n",
+      "     |  \n",
+      "     |  __copy__(self, /)\n",
+      "     |  \n",
+      "     |  __deepcopy__(self, memo, /)\n",
+      "     |  \n",
+      "     |  __eq__(self, value, /)\n",
+      "     |      Return self==value.\n",
+      "     |  \n",
+      "     |  __ge__(self, value, /)\n",
+      "     |      Return self>=value.\n",
+      "     |  \n",
+      "     |  __gt__(self, value, /)\n",
+      "     |      Return self>value.\n",
+      "     |  \n",
+      "     |  __hash__(self, /)\n",
+      "     |      Return hash(self).\n",
+      "     |  \n",
+      "     |  __le__(self, value, /)\n",
+      "     |      Return self<=value.\n",
+      "     |  \n",
+      "     |  __lt__(self, value, /)\n",
+      "     |      Return self<value.\n",
+      "     |  \n",
+      "     |  __ne__(self, value, /)\n",
+      "     |      Return self!=value.\n",
+      "     |  \n",
+      "     |  __repr__(self, /)\n",
+      "     |      Return repr(self).\n",
+      "     |  \n",
+      "     |  findall(self, /, string, pos=0, endpos=9223372036854775807)\n",
+      "     |      Return a list of all non-overlapping matches of pattern in string.\n",
+      "     |  \n",
+      "     |  finditer(self, /, string, pos=0, endpos=9223372036854775807)\n",
+      "     |      Return an iterator over all non-overlapping matches for the RE pattern in string.\n",
+      "     |      \n",
+      "     |      For each match, the iterator returns a match object.\n",
+      "     |  \n",
+      "     |  fullmatch(self, /, string, pos=0, endpos=9223372036854775807)\n",
+      "     |      Matches against all of the string.\n",
+      "     |  \n",
+      "     |  match(self, /, string, pos=0, endpos=9223372036854775807)\n",
+      "     |      Matches zero or more characters at the beginning of the string.\n",
+      "     |  \n",
+      "     |  scanner(self, /, string, pos=0, endpos=9223372036854775807)\n",
+      "     |  \n",
+      "     |  search(self, /, string, pos=0, endpos=9223372036854775807)\n",
+      "     |      Scan through string looking for a match, and return a corresponding match object instance.\n",
+      "     |      \n",
+      "     |      Return None if no position in the string matches.\n",
+      "     |  \n",
+      "     |  split(self, /, string, maxsplit=0)\n",
+      "     |      Split string by the occurrences of pattern.\n",
+      "     |  \n",
+      "     |  sub(self, /, repl, string, count=0)\n",
+      "     |      Return the string obtained by replacing the leftmost non-overlapping occurrences of pattern in string by the replacement repl.\n",
+      "     |  \n",
+      "     |  subn(self, /, repl, string, count=0)\n",
+      "     |      Return the tuple (new_string, number_of_subs_made) found by replacing the leftmost non-overlapping occurrences of pattern with the replacement repl.\n",
+      "     |  \n",
+      "     |  ----------------------------------------------------------------------\n",
+      "     |  Class methods defined here:\n",
+      "     |  \n",
+      "     |  __class_getitem__(...) from builtins.type\n",
+      "     |      See PEP 585\n",
+      "     |  \n",
+      "     |  ----------------------------------------------------------------------\n",
+      "     |  Data descriptors defined here:\n",
+      "     |  \n",
+      "     |  flags\n",
+      "     |      The regex matching flags.\n",
+      "     |  \n",
+      "     |  groupindex\n",
+      "     |      A dictionary mapping group names to group numbers.\n",
+      "     |  \n",
+      "     |  groups\n",
+      "     |      The number of capturing groups in the pattern.\n",
+      "     |  \n",
+      "     |  pattern\n",
+      "     |      The pattern string from which the RE object was compiled.\n",
+      "    \n",
+      "    class error(builtins.Exception)\n",
+      "     |  error(msg, pattern=None, pos=None)\n",
+      "     |  \n",
+      "     |  Exception raised for invalid regular expressions.\n",
+      "     |  \n",
+      "     |  Attributes:\n",
+      "     |  \n",
+      "     |      msg: The unformatted error message\n",
+      "     |      pattern: The regular expression pattern\n",
+      "     |      pos: The index in the pattern where compilation failed (may be None)\n",
+      "     |      lineno: The line corresponding to pos (may be None)\n",
+      "     |      colno: The column corresponding to pos (may be None)\n",
+      "     |  \n",
+      "     |  Method resolution order:\n",
+      "     |      error\n",
+      "     |      builtins.Exception\n",
+      "     |      builtins.BaseException\n",
+      "     |      builtins.object\n",
+      "     |  \n",
+      "     |  Methods defined here:\n",
+      "     |  \n",
+      "     |  __init__(self, msg, pattern=None, pos=None)\n",
+      "     |      Initialize self.  See help(type(self)) for accurate signature.\n",
+      "     |  \n",
+      "     |  ----------------------------------------------------------------------\n",
+      "     |  Data descriptors defined here:\n",
+      "     |  \n",
+      "     |  __weakref__\n",
+      "     |      list of weak references to the object (if defined)\n",
+      "     |  \n",
+      "     |  ----------------------------------------------------------------------\n",
+      "     |  Static methods inherited from builtins.Exception:\n",
+      "     |  \n",
+      "     |  __new__(*args, **kwargs) from builtins.type\n",
+      "     |      Create and return a new object.  See help(type) for accurate signature.\n",
+      "     |  \n",
+      "     |  ----------------------------------------------------------------------\n",
+      "     |  Methods inherited from builtins.BaseException:\n",
+      "     |  \n",
+      "     |  __delattr__(self, name, /)\n",
+      "     |      Implement delattr(self, name).\n",
+      "     |  \n",
+      "     |  __getattribute__(self, name, /)\n",
+      "     |      Return getattr(self, name).\n",
+      "     |  \n",
+      "     |  __reduce__(...)\n",
+      "     |      Helper for pickle.\n",
+      "     |  \n",
+      "     |  __repr__(self, /)\n",
+      "     |      Return repr(self).\n",
+      "     |  \n",
+      "     |  __setattr__(self, name, value, /)\n",
+      "     |      Implement setattr(self, name, value).\n",
+      "     |  \n",
+      "     |  __setstate__(...)\n",
+      "     |  \n",
+      "     |  __str__(self, /)\n",
+      "     |      Return str(self).\n",
+      "     |  \n",
+      "     |  with_traceback(...)\n",
+      "     |      Exception.with_traceback(tb) --\n",
+      "     |      set self.__traceback__ to tb and return self.\n",
+      "     |  \n",
+      "     |  ----------------------------------------------------------------------\n",
+      "     |  Data descriptors inherited from builtins.BaseException:\n",
+      "     |  \n",
+      "     |  __cause__\n",
+      "     |      exception cause\n",
+      "     |  \n",
+      "     |  __context__\n",
+      "     |      exception context\n",
+      "     |  \n",
+      "     |  __dict__\n",
+      "     |  \n",
+      "     |  __suppress_context__\n",
+      "     |  \n",
+      "     |  __traceback__\n",
+      "     |  \n",
+      "     |  args\n",
+      "\n",
+      "FUNCTIONS\n",
+      "    compile(pattern, flags=0)\n",
+      "        Compile a regular expression pattern, returning a Pattern object.\n",
+      "    \n",
+      "    escape(pattern)\n",
+      "        Escape special characters in a string.\n",
+      "    \n",
+      "    findall(pattern, string, flags=0)\n",
+      "        Return a list of all non-overlapping matches in the string.\n",
+      "        \n",
+      "        If one or more capturing groups are present in the pattern, return\n",
+      "        a list of groups; this will be a list of tuples if the pattern\n",
+      "        has more than one group.\n",
+      "        \n",
+      "        Empty matches are included in the result.\n",
+      "    \n",
+      "    finditer(pattern, string, flags=0)\n",
+      "        Return an iterator over all non-overlapping matches in the\n",
+      "        string.  For each match, the iterator returns a Match object.\n",
+      "        \n",
+      "        Empty matches are included in the result.\n",
+      "    \n",
+      "    fullmatch(pattern, string, flags=0)\n",
+      "        Try to apply the pattern to all of the string, returning\n",
+      "        a Match object, or None if no match was found.\n",
+      "    \n",
+      "    match(pattern, string, flags=0)\n",
+      "        Try to apply the pattern at the start of the string, returning\n",
+      "        a Match object, or None if no match was found.\n",
+      "    \n",
+      "    purge()\n",
+      "        Clear the regular expression caches\n",
+      "    \n",
+      "    search(pattern, string, flags=0)\n",
+      "        Scan through string looking for a match to the pattern, returning\n",
+      "        a Match object, or None if no match was found.\n",
+      "    \n",
+      "    split(pattern, string, maxsplit=0, flags=0)\n",
+      "        Split the source string by the occurrences of the pattern,\n",
+      "        returning a list containing the resulting substrings.  If\n",
+      "        capturing parentheses are used in pattern, then the text of all\n",
+      "        groups in the pattern are also returned as part of the resulting\n",
+      "        list.  If maxsplit is nonzero, at most maxsplit splits occur,\n",
+      "        and the remainder of the string is returned as the final element\n",
+      "        of the list.\n",
+      "    \n",
+      "    sub(pattern, repl, string, count=0, flags=0)\n",
+      "        Return the string obtained by replacing the leftmost\n",
+      "        non-overlapping occurrences of the pattern in string by the\n",
+      "        replacement repl.  repl can be either a string or a callable;\n",
+      "        if a string, backslash escapes in it are processed.  If it is\n",
+      "        a callable, it's passed the Match object and must return\n",
+      "        a replacement string to be used.\n",
+      "    \n",
+      "    subn(pattern, repl, string, count=0, flags=0)\n",
+      "        Return a 2-tuple containing (new_string, number).\n",
+      "        new_string is the string obtained by replacing the leftmost\n",
+      "        non-overlapping occurrences of the pattern in the source\n",
+      "        string by the replacement repl.  number is the number of\n",
+      "        substitutions that were made. repl can be either a string or a\n",
+      "        callable; if a string, backslash escapes in it are processed.\n",
+      "        If it is a callable, it's passed the Match object and must\n",
+      "        return a replacement string to be used.\n",
+      "    \n",
+      "    template(pattern, flags=0)\n",
+      "        Compile a template pattern, returning a Pattern object\n",
+      "\n",
+      "DATA\n",
+      "    A = re.ASCII\n",
+      "    ASCII = re.ASCII\n",
+      "    DOTALL = re.DOTALL\n",
+      "    I = re.IGNORECASE\n",
+      "    IGNORECASE = re.IGNORECASE\n",
+      "    L = re.LOCALE\n",
+      "    LOCALE = re.LOCALE\n",
+      "    M = re.MULTILINE\n",
+      "    MULTILINE = re.MULTILINE\n",
+      "    S = re.DOTALL\n",
+      "    U = re.UNICODE\n",
+      "    UNICODE = re.UNICODE\n",
+      "    VERBOSE = re.VERBOSE\n",
+      "    X = re.VERBOSE\n",
+      "    __all__ = ['match', 'fullmatch', 'search', 'sub', 'subn', 'split', 'fi...\n",
+      "\n",
+      "VERSION\n",
+      "    2.2.1\n",
+      "\n",
+      "FILE\n",
+      "    c:\\users\\josev\\appdata\\local\\programs\\python\\python310\\lib\\re.py\n",
+      "\n",
+      "\n"
+     ]
+    }
+   ],
+   "source": [
+    "help(re)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 75,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['Some', 'say', 'the', 'world', 'will', 'end', 'in', 'fire', 'Some', 'say', 'in', 'ice', 'From', 'what', 'I’ve', 'tasted', 'of', 'desire', 'I', 'hold', 'with', 'those', 'who', 'favor', 'fire', 'But', 'if', 'it', 'had', 'to', 'perish', 'twice', 'I', 'think', 'I', 'know', 'enough', 'of', 'hate', 'To', 'say', 'that', 'for', 'destruction', 'ice', 'Is', 'also', 'great', 'And', 'would', 'suffice']\n"
+     ]
+    }
+   ],
+   "source": [
+    "# split the string into a list of strings using the space delimiter\n",
+    "string_list = re.split(\"[,.\\s\\n\\r]\", poem)\n",
+    "\n",
+    "string_list = [word for word in string_list if word != '']\n",
+    "print(string_list)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 45,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# Count the frequency of each word in the string in a dictionary. \n",
+    "# Strip the periods, line breaks and commas from the text. \n",
+    "# Make sure to remove empty strings from your dictionary."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 79,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "{'Some': 2, 'say': 3, 'the': 1, 'world': 1, 'will': 1, 'end': 1, 'in': 2, 'fire': 2, 'ice': 2, 'From': 1, 'what': 1, 'I’ve': 1, 'tasted': 1, 'of': 2, 'desire': 1, 'I': 3, 'hold': 1, 'with': 1, 'those': 1, 'who': 1, 'favor': 1, 'But': 1, 'if': 1, 'it': 1, 'had': 1, 'to': 1, 'perish': 1, 'twice': 1, 'think': 1, 'know': 1, 'enough': 1, 'hate': 1, 'To': 1, 'that': 1, 'for': 1, 'destruction': 1, 'Is': 1, 'also': 1, 'great': 1, 'And': 1, 'would': 1, 'suffice': 1}\n"
+     ]
+    }
+   ],
+   "source": [
+    "dict_of_counts = {item:string_list.count(item) for item in string_list}\n",
+    "print(dict_of_counts)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "In the cell below, find all the words that appear in the text and do not appear in the blacklist. You must parse the string but can choose any data structure you wish for the words that do not appear in the blacklist. Remove all non letter characters and convert all words to lower case."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 80,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "blacklist = ['and', 'as', 'an', 'a', 'the', 'in', 'it']\n",
+    "\n",
+    "poem = \"\"\"I was angry with my friend; \n",
+    "I told my wrath, my wrath did end.\n",
+    "I was angry with my foe: \n",
+    "I told it not, my wrath did grow. \n",
+    "\n",
+    "And I waterd it in fears,\n",
+    "Night & morning with my tears: \n",
+    "And I sunned it with smiles,\n",
+    "And with soft deceitful wiles. \n",
+    "\n",
+    "And it grew both day and night. \n",
+    "Till it bore an apple bright. \n",
+    "And my foe beheld it shine,\n",
+    "And he knew that it was mine. \n",
+    "\n",
+    "And into my garden stole, \n",
+    "When the night had veild the pole; \n",
+    "In the morning glad I see; \n",
+    "My foe outstretched beneath the tree.\"\"\"\n",
+    "\n",
+    "# Your code here:\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 81,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "'i was angry with my friend; \\ni told my wrath, my wrath did end.\\ni was angry with my foe: \\ni told it not, my wrath did grow. \\n\\nand i waterd it in fears,\\nnight & morning with my tears: \\nand i sunned it with smiles,\\nand with soft deceitful wiles. \\n\\nand it grew both day and night. \\ntill it bore an apple bright. \\nand my foe beheld it shine,\\nand he knew that it was mine. \\n\\nand into my garden stole, \\nwhen the night had veild the pole; \\nin the morning glad i see; \\nmy foe outstretched beneath the tree.'"
+      ]
+     },
+     "execution_count": 81,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "poem = poem.lower()\n",
+    "poem"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 83,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['i', 'was', 'angry', 'with', 'my', 'friend', 'i', 'told', 'my', 'wrath', 'my', 'wrath', 'did', 'end', 'i', 'was', 'angry', 'with', 'my', 'foe', 'i', 'told', 'it', 'not', 'my', 'wrath', 'did', 'grow', 'and', 'i', 'waterd', 'it', 'in', 'fears', 'night', '&', 'morning', 'with', 'my', 'tears', 'and', 'i', 'sunned', 'it', 'with', 'smiles', 'and', 'with', 'soft', 'deceitful', 'wiles', 'and', 'it', 'grew', 'both', 'day', 'and', 'night', 'till', 'it', 'bore', 'an', 'apple', 'bright', 'and', 'my', 'foe', 'beheld', 'it', 'shine', 'and', 'he', 'knew', 'that', 'it', 'was', 'mine', 'and', 'into', 'my', 'garden', 'stole', 'when', 'the', 'night', 'had', 'veild', 'the', 'pole', 'in', 'the', 'morning', 'glad', 'i', 'see', 'my', 'foe', 'outstretched', 'beneath', 'the', 'tree']\n"
+     ]
+    }
+   ],
+   "source": [
+    "string_list = re.split(\"[,.;:\\s\\n\\r]\", poem)\n",
+    "string_list = [word for word in string_list if word != '']\n",
+    "print(string_list)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 85,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['i', 'was', 'angry', 'with', 'my', 'friend', 'i', 'told', 'my', 'wrath', 'my', 'wrath', 'did', 'end', 'i', 'was', 'angry', 'with', 'my', 'foe', 'i', 'told', 'not', 'my', 'wrath', 'did', 'grow', 'i', 'waterd', 'fears', 'night', '&', 'morning', 'with', 'my', 'tears', 'i', 'sunned', 'with', 'smiles', 'with', 'soft', 'deceitful', 'wiles', 'grew', 'both', 'day', 'night', 'till', 'bore', 'apple', 'bright', 'my', 'foe', 'beheld', 'shine', 'he', 'knew', 'that', 'was', 'mine', 'into', 'my', 'garden', 'stole', 'when', 'night', 'had', 'veild', 'pole', 'morning', 'glad', 'i', 'see', 'my', 'foe', 'outstretched', 'beneath', 'tree']\n"
+     ]
+    }
+   ],
+   "source": [
+    "string_list = [word for word in string_list if word not in blacklist]\n",
+    "print(string_list)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Challenge 3 - Regular Expressions\n",
+    "\n",
+    "Sometimes, we would like to perform more complex manipulations of our string. This is where regular expressions come in handy. In the cell below, return all characters that are upper case from the string specified below."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 86,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "poem = \"\"\"The apparition of these faces in the crowd;\n",
+    "Petals on a wet, black bough.\"\"\"\n",
+    "\n",
+    "# Your code here:\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 96,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['T', 'P']\n"
+     ]
+    }
+   ],
+   "source": [
+    "letters_list = re.split(r\"[a-z.,;: \\s]\", poem)\n",
+    "letters_list = [word for word in letters_list if word != '']\n",
+    "print(letters_list)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "In the cell below, filter the list provided and return all elements of the list containing a number. To filter the list, use the `re.search` function. Check if the function does not return `None`. You can read more about the `re.search` function [here](https://docs.python.org/3/library/re.html)."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 97,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "data = ['123abc', 'abc123', 'JohnSmith1', 'ABBY4', 'JANE']\n",
+    "\n",
+    "# Your code here:\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 154,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['123abc', 'abc123', 'JohnSmith1', 'ABBY4']\n"
+     ]
+    }
+   ],
+   "source": [
+    "data = [word for word in data if re.search(r'[\\d.+?]', word) != None]\n",
+    "print(data)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Bonus Challenge - Regular Expressions II\n",
+    "\n",
+    "In the cell below, filter the list provided to keep only strings containing at least one digit and at least one lower case letter. As in the previous question, use the `re.search` function and check that the result is not `None`.\n",
+    "\n",
+    "To read more about regular expressions, check out [this link](https://developers.google.com/edu/python/regular-expressions)."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 155,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "data = ['123abc', 'abc123', 'JohnSmith1', 'ABBY4', 'JANE']\n",
+    "# Your code here:\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 156,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['123abc', 'abc123', 'JohnSmith1']\n"
+     ]
+    }
+   ],
+   "source": [
+    "data = [word for word in data if re.search(r'(?=.*\\d)(?=.*[a-z])', word) != None]\n",
+    "print(data)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.10.3"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}
diff --git a/your-code/.ipynb_checkpoints/challenge-2-checkpoint.ipynb b/your-code/.ipynb_checkpoints/challenge-2-checkpoint.ipynb
index d76069e..cedc6fa 100644
--- a/your-code/.ipynb_checkpoints/challenge-2-checkpoint.ipynb
+++ b/your-code/.ipynb_checkpoints/challenge-2-checkpoint.ipynb
@@ -72,7 +72,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 1,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -88,13 +88,30 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 2,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['Ironhack is cool.', 'I love Ironhack.', 'I am a student at Ironhack.']"
+      ]
+     },
+     "execution_count": 2,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "corpus = []\n",
     "\n",
-    "# Write your code here\n"
+    "# Write your code here\n",
+    "for i in range(1,4):\n",
+    "    with open(f'doc{i}.txt', 'r') as file:\n",
+    "        data = file.read().rstrip() # valid only if text in file is a single line\n",
+    "        corpus += [data]\n",
+    "\n",
+    "corpus"
    ]
   },
   {
@@ -106,9 +123,17 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 3,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['Ironhack is cool.', 'I love Ironhack.', 'I am a student at Ironhack.']\n"
+     ]
+    }
+   ],
    "source": [
     "print(corpus)"
    ]
@@ -136,11 +161,31 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 4,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['ironhack is cool', 'i love ironhack', 'i am a student at ironhack']"
+      ]
+     },
+     "execution_count": 4,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
-    "# Write your code here"
+    "# Write your code here\n",
+    "punc = '''!()-[]{};:'\"\\,<>./?@#$%^&*_~'''\n",
+    "\n",
+    "for string in corpus:\n",
+    "    if string.endswith(\".\") == True:\n",
+    "        string = string.replace(\".\", \"\")\n",
+    "        corpus += [string.lower()]\n",
+    "    \n",
+    "corpus = corpus[3:6]\n",
+    "corpus"
    ]
   },
   {
@@ -152,7 +197,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 5,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -172,11 +217,105 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 6,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['ironhack is cool', 'i love ironhack', 'i am a student at ironhack']"
+      ]
+     },
+     "execution_count": 6,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
-    "# Write your code here"
+    "corpus"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 21,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[['ironhack', 'is', 'cool'],\n",
+       " ['i', 'love', 'ironhack'],\n",
+       " ['i', 'am', 'a', 'student', 'at', 'ironhack']]"
+      ]
+     },
+     "execution_count": 21,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "import re\n",
+    "corpus = [re.split(\"[,.;:\\s\\n\\r]\", string) for string in corpus]\n",
+    "corpus"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 51,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['ironhack',\n",
+       " 'is',\n",
+       " 'cool',\n",
+       " 'i',\n",
+       " 'love',\n",
+       " 'ironhack',\n",
+       " 'i',\n",
+       " 'am',\n",
+       " 'a',\n",
+       " 'student',\n",
+       " 'at',\n",
+       " 'ironhack']"
+      ]
+     },
+     "execution_count": 51,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "bag_of_words = [string for lista in corpus for string in lista]\n",
+    "bag_of_words"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 53,
+   "metadata": {},
+   "outputs": [
+    {
+     "ename": "TypeError",
+     "evalue": "argument of type 'NoneType' is not iterable",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
+      "\u001b[1;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
+      "Input \u001b[1;32mIn [53]\u001b[0m, in \u001b[0;36m<cell line: 2>\u001b[1;34m()\u001b[0m\n\u001b[0;32m      2\u001b[0m \u001b[38;5;28;01mfor\u001b[39;00m lista \u001b[38;5;129;01min\u001b[39;00m corpus:\n\u001b[0;32m      3\u001b[0m     \u001b[38;5;28;01mfor\u001b[39;00m string \u001b[38;5;129;01min\u001b[39;00m lista:\n\u001b[1;32m----> 4\u001b[0m         \u001b[38;5;28;01mif\u001b[39;00m \u001b[43mstring\u001b[49m\u001b[43m \u001b[49m\u001b[38;5;129;43;01min\u001b[39;49;00m\u001b[43m \u001b[49m\u001b[43mbag_of_words\u001b[49m:\n\u001b[0;32m      5\u001b[0m             bag_of_words \u001b[38;5;241m=\u001b[39m bag_of_words\u001b[38;5;241m.\u001b[39mappend(word)\n\u001b[0;32m      7\u001b[0m bag_of_words\n",
+      "\u001b[1;31mTypeError\u001b[0m: argument of type 'NoneType' is not iterable"
+     ]
+    }
+   ],
+   "source": [
+    "# Write your code here\n",
+    "for lista in corpus:\n",
+    "    for string in lista:\n",
+    "        if string in bag_of_words:\n",
+    "            bag_of_words = bag_of_words.append(word)\n",
+    "\n",
+    "bag_of_words"
    ]
   },
   {
@@ -192,9 +331,17 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 8,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[]\n"
+     ]
+    }
+   ],
    "source": [
     "print(bag_of_words)"
    ]
@@ -208,7 +355,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 9,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -228,9 +375,17 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 10,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[]\n"
+     ]
+    }
+   ],
    "source": [
     "print(term_freq)"
    ]
@@ -268,7 +423,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 11,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -309,7 +464,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -323,7 +478,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.3"
+   "version": "3.10.3"
   }
  },
  "nbformat": 4,
diff --git a/your-code/challenge-1.ipynb b/your-code/challenge-1.ipynb
index 4302084..0859d23 100644
--- a/your-code/challenge-1.ipynb
+++ b/your-code/challenge-1.ipynb
@@ -15,7 +15,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 1,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -33,12 +33,24 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 3,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "'Durante un tiempo no estuvo segura de si su marido era su marido.'"
+      ]
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "str_list = ['Durante', 'un', 'tiempo', 'no', 'estuvo', 'segura', 'de', 'si', 'su', 'marido', 'era', 'su', 'marido']\n",
-    "# Your code here:\n"
+    "# Your code here:\n",
+    "\" \".join(str_list) + \".\""
    ]
   },
   {
@@ -50,12 +62,97 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 24,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['bananas',\n",
+       " 'chocolate',\n",
+       " 'bread',\n",
+       " 'diapers',\n",
+       " 'ice cream',\n",
+       " 'brownie mix',\n",
+       " 'broccoli']"
+      ]
+     },
+     "execution_count": 24,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "food_list = ['Bananas', 'Chocolate', 'bread', 'diapers', 'Ice Cream', 'Brownie Mix', 'broccoli']\n",
-    "# Your code here:\n"
+    "# Your code here:\n",
+    "# convertir lista original a nueva lista solo con minusculas\n",
+    "grocery_list = [i.lower() for i in food_list]\n",
+    "grocery_list"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 77,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "'bananas chocolate bread diapers ice cream brownie mix broccoli'"
+      ]
+     },
+     "execution_count": 77,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "# convertir lista en string único\n",
+    "a = \" \".join(grocery_list)\n",
+    "a"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 31,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['bananas', 'bread', 'brownie', 'broccoli']"
+      ]
+     },
+     "execution_count": 31,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "# obtener sólo las palabras que empiezan por b\n",
+    "b = re.findall(r\"b.+?\\b\", a)\n",
+    "b"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 33,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "'bananas, bread, brownie, broccoli.'"
+      ]
+     },
+     "execution_count": 33,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "# unir palabras obtenidas\n",
+    "\", \".join(b) + \".\""
    ]
   },
   {
@@ -69,9 +166,40 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 35,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "78.53981633974483"
+      ]
+     },
+     "execution_count": 35,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "import math\n",
+    "pi = math.pi\n",
+    "circle_area = pi*(5**2)\n",
+    "circle_area"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 40,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The area of the circle with radius: 5 is: 78.53981633974483\n"
+     ]
+    }
+   ],
    "source": [
     "import math\n",
     "\n",
@@ -82,14 +210,14 @@
     "def area(x, pi = math.pi):\n",
     "    # This function takes a radius and returns the area of a circle. We also pass a default value for pi.\n",
     "    # Input: Float (and default value for pi)\n",
+    "    circle_area = pi*(x**2)\n",
     "    # Output: Float\n",
-    "    \n",
-    "    # Sample input: 5.0\n",
-    "    # Sample Output: 78.53981633\n",
-    "    \n",
-    "    # Your code here:\n",
-    "    \n",
-    "    \n",
+    "    return print(f\"{string1} {x} {string2} {circle_area}\")\n",
+    "        \n",
+    "# Your code here:    \n",
+    "# Sample input: 5.0\n",
+    "# Sample Output: 78.53981633\n",
+    "area(5)\n",
     "# Your output string here:"
    ]
   },
@@ -106,7 +234,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 41,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -123,6 +251,528 @@
     "# Your code here:\n"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 42,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Help on module re:\n",
+      "\n",
+      "NAME\n",
+      "    re - Support for regular expressions (RE).\n",
+      "\n",
+      "MODULE REFERENCE\n",
+      "    https://docs.python.org/3.10/library/re.html\n",
+      "    \n",
+      "    The following documentation is automatically generated from the Python\n",
+      "    source files.  It may be incomplete, incorrect or include features that\n",
+      "    are considered implementation detail and may vary between Python\n",
+      "    implementations.  When in doubt, consult the module reference at the\n",
+      "    location listed above.\n",
+      "\n",
+      "DESCRIPTION\n",
+      "    This module provides regular expression matching operations similar to\n",
+      "    those found in Perl.  It supports both 8-bit and Unicode strings; both\n",
+      "    the pattern and the strings being processed can contain null bytes and\n",
+      "    characters outside the US ASCII range.\n",
+      "    \n",
+      "    Regular expressions can contain both special and ordinary characters.\n",
+      "    Most ordinary characters, like \"A\", \"a\", or \"0\", are the simplest\n",
+      "    regular expressions; they simply match themselves.  You can\n",
+      "    concatenate ordinary characters, so last matches the string 'last'.\n",
+      "    \n",
+      "    The special characters are:\n",
+      "        \".\"      Matches any character except a newline.\n",
+      "        \"^\"      Matches the start of the string.\n",
+      "        \"$\"      Matches the end of the string or just before the newline at\n",
+      "                 the end of the string.\n",
+      "        \"*\"      Matches 0 or more (greedy) repetitions of the preceding RE.\n",
+      "                 Greedy means that it will match as many repetitions as possible.\n",
+      "        \"+\"      Matches 1 or more (greedy) repetitions of the preceding RE.\n",
+      "        \"?\"      Matches 0 or 1 (greedy) of the preceding RE.\n",
+      "        *?,+?,?? Non-greedy versions of the previous three special characters.\n",
+      "        {m,n}    Matches from m to n repetitions of the preceding RE.\n",
+      "        {m,n}?   Non-greedy version of the above.\n",
+      "        \"\\\\\"     Either escapes special characters or signals a special sequence.\n",
+      "        []       Indicates a set of characters.\n",
+      "                 A \"^\" as the first character indicates a complementing set.\n",
+      "        \"|\"      A|B, creates an RE that will match either A or B.\n",
+      "        (...)    Matches the RE inside the parentheses.\n",
+      "                 The contents can be retrieved or matched later in the string.\n",
+      "        (?aiLmsux) The letters set the corresponding flags defined below.\n",
+      "        (?:...)  Non-grouping version of regular parentheses.\n",
+      "        (?P<name>...) The substring matched by the group is accessible by name.\n",
+      "        (?P=name)     Matches the text matched earlier by the group named name.\n",
+      "        (?#...)  A comment; ignored.\n",
+      "        (?=...)  Matches if ... matches next, but doesn't consume the string.\n",
+      "        (?!...)  Matches if ... doesn't match next.\n",
+      "        (?<=...) Matches if preceded by ... (must be fixed length).\n",
+      "        (?<!...) Matches if not preceded by ... (must be fixed length).\n",
+      "        (?(id/name)yes|no) Matches yes pattern if the group with id/name matched,\n",
+      "                           the (optional) no pattern otherwise.\n",
+      "    \n",
+      "    The special sequences consist of \"\\\\\" and a character from the list\n",
+      "    below.  If the ordinary character is not on the list, then the\n",
+      "    resulting RE will match the second character.\n",
+      "        \\number  Matches the contents of the group of the same number.\n",
+      "        \\A       Matches only at the start of the string.\n",
+      "        \\Z       Matches only at the end of the string.\n",
+      "        \\b       Matches the empty string, but only at the start or end of a word.\n",
+      "        \\B       Matches the empty string, but not at the start or end of a word.\n",
+      "        \\d       Matches any decimal digit; equivalent to the set [0-9] in\n",
+      "                 bytes patterns or string patterns with the ASCII flag.\n",
+      "                 In string patterns without the ASCII flag, it will match the whole\n",
+      "                 range of Unicode digits.\n",
+      "        \\D       Matches any non-digit character; equivalent to [^\\d].\n",
+      "        \\s       Matches any whitespace character; equivalent to [ \\t\\n\\r\\f\\v] in\n",
+      "                 bytes patterns or string patterns with the ASCII flag.\n",
+      "                 In string patterns without the ASCII flag, it will match the whole\n",
+      "                 range of Unicode whitespace characters.\n",
+      "        \\S       Matches any non-whitespace character; equivalent to [^\\s].\n",
+      "        \\w       Matches any alphanumeric character; equivalent to [a-zA-Z0-9_]\n",
+      "                 in bytes patterns or string patterns with the ASCII flag.\n",
+      "                 In string patterns without the ASCII flag, it will match the\n",
+      "                 range of Unicode alphanumeric characters (letters plus digits\n",
+      "                 plus underscore).\n",
+      "                 With LOCALE, it will match the set [0-9_] plus characters defined\n",
+      "                 as letters for the current locale.\n",
+      "        \\W       Matches the complement of \\w.\n",
+      "        \\\\       Matches a literal backslash.\n",
+      "    \n",
+      "    This module exports the following functions:\n",
+      "        match     Match a regular expression pattern to the beginning of a string.\n",
+      "        fullmatch Match a regular expression pattern to all of a string.\n",
+      "        search    Search a string for the presence of a pattern.\n",
+      "        sub       Substitute occurrences of a pattern found in a string.\n",
+      "        subn      Same as sub, but also return the number of substitutions made.\n",
+      "        split     Split a string by the occurrences of a pattern.\n",
+      "        findall   Find all occurrences of a pattern in a string.\n",
+      "        finditer  Return an iterator yielding a Match object for each match.\n",
+      "        compile   Compile a pattern into a Pattern object.\n",
+      "        purge     Clear the regular expression cache.\n",
+      "        escape    Backslash all non-alphanumerics in a string.\n",
+      "    \n",
+      "    Each function other than purge and escape can take an optional 'flags' argument\n",
+      "    consisting of one or more of the following module constants, joined by \"|\".\n",
+      "    A, L, and U are mutually exclusive.\n",
+      "        A  ASCII       For string patterns, make \\w, \\W, \\b, \\B, \\d, \\D\n",
+      "                       match the corresponding ASCII character categories\n",
+      "                       (rather than the whole Unicode categories, which is the\n",
+      "                       default).\n",
+      "                       For bytes patterns, this flag is the only available\n",
+      "                       behaviour and needn't be specified.\n",
+      "        I  IGNORECASE  Perform case-insensitive matching.\n",
+      "        L  LOCALE      Make \\w, \\W, \\b, \\B, dependent on the current locale.\n",
+      "        M  MULTILINE   \"^\" matches the beginning of lines (after a newline)\n",
+      "                       as well as the string.\n",
+      "                       \"$\" matches the end of lines (before a newline) as well\n",
+      "                       as the end of the string.\n",
+      "        S  DOTALL      \".\" matches any character at all, including the newline.\n",
+      "        X  VERBOSE     Ignore whitespace and comments for nicer looking RE's.\n",
+      "        U  UNICODE     For compatibility only. Ignored for string patterns (it\n",
+      "                       is the default), and forbidden for bytes patterns.\n",
+      "    \n",
+      "    This module also defines an exception 'error'.\n",
+      "\n",
+      "CLASSES\n",
+      "    builtins.Exception(builtins.BaseException)\n",
+      "        error\n",
+      "    builtins.object\n",
+      "        Match\n",
+      "        Pattern\n",
+      "    \n",
+      "    class Match(builtins.object)\n",
+      "     |  The result of re.match() and re.search().\n",
+      "     |  Match objects always have a boolean value of True.\n",
+      "     |  \n",
+      "     |  Methods defined here:\n",
+      "     |  \n",
+      "     |  __copy__(self, /)\n",
+      "     |  \n",
+      "     |  __deepcopy__(self, memo, /)\n",
+      "     |  \n",
+      "     |  __getitem__(self, key, /)\n",
+      "     |      Return self[key].\n",
+      "     |  \n",
+      "     |  __repr__(self, /)\n",
+      "     |      Return repr(self).\n",
+      "     |  \n",
+      "     |  end(self, group=0, /)\n",
+      "     |      Return index of the end of the substring matched by group.\n",
+      "     |  \n",
+      "     |  expand(self, /, template)\n",
+      "     |      Return the string obtained by doing backslash substitution on the string template, as done by the sub() method.\n",
+      "     |  \n",
+      "     |  group(...)\n",
+      "     |      group([group1, ...]) -> str or tuple.\n",
+      "     |      Return subgroup(s) of the match by indices or names.\n",
+      "     |      For 0 returns the entire match.\n",
+      "     |  \n",
+      "     |  groupdict(self, /, default=None)\n",
+      "     |      Return a dictionary containing all the named subgroups of the match, keyed by the subgroup name.\n",
+      "     |      \n",
+      "     |      default\n",
+      "     |        Is used for groups that did not participate in the match.\n",
+      "     |  \n",
+      "     |  groups(self, /, default=None)\n",
+      "     |      Return a tuple containing all the subgroups of the match, from 1.\n",
+      "     |      \n",
+      "     |      default\n",
+      "     |        Is used for groups that did not participate in the match.\n",
+      "     |  \n",
+      "     |  span(self, group=0, /)\n",
+      "     |      For match object m, return the 2-tuple (m.start(group), m.end(group)).\n",
+      "     |  \n",
+      "     |  start(self, group=0, /)\n",
+      "     |      Return index of the start of the substring matched by group.\n",
+      "     |  \n",
+      "     |  ----------------------------------------------------------------------\n",
+      "     |  Class methods defined here:\n",
+      "     |  \n",
+      "     |  __class_getitem__(...) from builtins.type\n",
+      "     |      See PEP 585\n",
+      "     |  \n",
+      "     |  ----------------------------------------------------------------------\n",
+      "     |  Data descriptors defined here:\n",
+      "     |  \n",
+      "     |  endpos\n",
+      "     |      The index into the string beyond which the RE engine will not go.\n",
+      "     |  \n",
+      "     |  lastgroup\n",
+      "     |      The name of the last matched capturing group.\n",
+      "     |  \n",
+      "     |  lastindex\n",
+      "     |      The integer index of the last matched capturing group.\n",
+      "     |  \n",
+      "     |  pos\n",
+      "     |      The index into the string at which the RE engine started looking for a match.\n",
+      "     |  \n",
+      "     |  re\n",
+      "     |      The regular expression object.\n",
+      "     |  \n",
+      "     |  regs\n",
+      "     |  \n",
+      "     |  string\n",
+      "     |      The string passed to match() or search().\n",
+      "    \n",
+      "    class Pattern(builtins.object)\n",
+      "     |  Compiled regular expression object.\n",
+      "     |  \n",
+      "     |  Methods defined here:\n",
+      "     |  \n",
+      "     |  __copy__(self, /)\n",
+      "     |  \n",
+      "     |  __deepcopy__(self, memo, /)\n",
+      "     |  \n",
+      "     |  __eq__(self, value, /)\n",
+      "     |      Return self==value.\n",
+      "     |  \n",
+      "     |  __ge__(self, value, /)\n",
+      "     |      Return self>=value.\n",
+      "     |  \n",
+      "     |  __gt__(self, value, /)\n",
+      "     |      Return self>value.\n",
+      "     |  \n",
+      "     |  __hash__(self, /)\n",
+      "     |      Return hash(self).\n",
+      "     |  \n",
+      "     |  __le__(self, value, /)\n",
+      "     |      Return self<=value.\n",
+      "     |  \n",
+      "     |  __lt__(self, value, /)\n",
+      "     |      Return self<value.\n",
+      "     |  \n",
+      "     |  __ne__(self, value, /)\n",
+      "     |      Return self!=value.\n",
+      "     |  \n",
+      "     |  __repr__(self, /)\n",
+      "     |      Return repr(self).\n",
+      "     |  \n",
+      "     |  findall(self, /, string, pos=0, endpos=9223372036854775807)\n",
+      "     |      Return a list of all non-overlapping matches of pattern in string.\n",
+      "     |  \n",
+      "     |  finditer(self, /, string, pos=0, endpos=9223372036854775807)\n",
+      "     |      Return an iterator over all non-overlapping matches for the RE pattern in string.\n",
+      "     |      \n",
+      "     |      For each match, the iterator returns a match object.\n",
+      "     |  \n",
+      "     |  fullmatch(self, /, string, pos=0, endpos=9223372036854775807)\n",
+      "     |      Matches against all of the string.\n",
+      "     |  \n",
+      "     |  match(self, /, string, pos=0, endpos=9223372036854775807)\n",
+      "     |      Matches zero or more characters at the beginning of the string.\n",
+      "     |  \n",
+      "     |  scanner(self, /, string, pos=0, endpos=9223372036854775807)\n",
+      "     |  \n",
+      "     |  search(self, /, string, pos=0, endpos=9223372036854775807)\n",
+      "     |      Scan through string looking for a match, and return a corresponding match object instance.\n",
+      "     |      \n",
+      "     |      Return None if no position in the string matches.\n",
+      "     |  \n",
+      "     |  split(self, /, string, maxsplit=0)\n",
+      "     |      Split string by the occurrences of pattern.\n",
+      "     |  \n",
+      "     |  sub(self, /, repl, string, count=0)\n",
+      "     |      Return the string obtained by replacing the leftmost non-overlapping occurrences of pattern in string by the replacement repl.\n",
+      "     |  \n",
+      "     |  subn(self, /, repl, string, count=0)\n",
+      "     |      Return the tuple (new_string, number_of_subs_made) found by replacing the leftmost non-overlapping occurrences of pattern with the replacement repl.\n",
+      "     |  \n",
+      "     |  ----------------------------------------------------------------------\n",
+      "     |  Class methods defined here:\n",
+      "     |  \n",
+      "     |  __class_getitem__(...) from builtins.type\n",
+      "     |      See PEP 585\n",
+      "     |  \n",
+      "     |  ----------------------------------------------------------------------\n",
+      "     |  Data descriptors defined here:\n",
+      "     |  \n",
+      "     |  flags\n",
+      "     |      The regex matching flags.\n",
+      "     |  \n",
+      "     |  groupindex\n",
+      "     |      A dictionary mapping group names to group numbers.\n",
+      "     |  \n",
+      "     |  groups\n",
+      "     |      The number of capturing groups in the pattern.\n",
+      "     |  \n",
+      "     |  pattern\n",
+      "     |      The pattern string from which the RE object was compiled.\n",
+      "    \n",
+      "    class error(builtins.Exception)\n",
+      "     |  error(msg, pattern=None, pos=None)\n",
+      "     |  \n",
+      "     |  Exception raised for invalid regular expressions.\n",
+      "     |  \n",
+      "     |  Attributes:\n",
+      "     |  \n",
+      "     |      msg: The unformatted error message\n",
+      "     |      pattern: The regular expression pattern\n",
+      "     |      pos: The index in the pattern where compilation failed (may be None)\n",
+      "     |      lineno: The line corresponding to pos (may be None)\n",
+      "     |      colno: The column corresponding to pos (may be None)\n",
+      "     |  \n",
+      "     |  Method resolution order:\n",
+      "     |      error\n",
+      "     |      builtins.Exception\n",
+      "     |      builtins.BaseException\n",
+      "     |      builtins.object\n",
+      "     |  \n",
+      "     |  Methods defined here:\n",
+      "     |  \n",
+      "     |  __init__(self, msg, pattern=None, pos=None)\n",
+      "     |      Initialize self.  See help(type(self)) for accurate signature.\n",
+      "     |  \n",
+      "     |  ----------------------------------------------------------------------\n",
+      "     |  Data descriptors defined here:\n",
+      "     |  \n",
+      "     |  __weakref__\n",
+      "     |      list of weak references to the object (if defined)\n",
+      "     |  \n",
+      "     |  ----------------------------------------------------------------------\n",
+      "     |  Static methods inherited from builtins.Exception:\n",
+      "     |  \n",
+      "     |  __new__(*args, **kwargs) from builtins.type\n",
+      "     |      Create and return a new object.  See help(type) for accurate signature.\n",
+      "     |  \n",
+      "     |  ----------------------------------------------------------------------\n",
+      "     |  Methods inherited from builtins.BaseException:\n",
+      "     |  \n",
+      "     |  __delattr__(self, name, /)\n",
+      "     |      Implement delattr(self, name).\n",
+      "     |  \n",
+      "     |  __getattribute__(self, name, /)\n",
+      "     |      Return getattr(self, name).\n",
+      "     |  \n",
+      "     |  __reduce__(...)\n",
+      "     |      Helper for pickle.\n",
+      "     |  \n",
+      "     |  __repr__(self, /)\n",
+      "     |      Return repr(self).\n",
+      "     |  \n",
+      "     |  __setattr__(self, name, value, /)\n",
+      "     |      Implement setattr(self, name, value).\n",
+      "     |  \n",
+      "     |  __setstate__(...)\n",
+      "     |  \n",
+      "     |  __str__(self, /)\n",
+      "     |      Return str(self).\n",
+      "     |  \n",
+      "     |  with_traceback(...)\n",
+      "     |      Exception.with_traceback(tb) --\n",
+      "     |      set self.__traceback__ to tb and return self.\n",
+      "     |  \n",
+      "     |  ----------------------------------------------------------------------\n",
+      "     |  Data descriptors inherited from builtins.BaseException:\n",
+      "     |  \n",
+      "     |  __cause__\n",
+      "     |      exception cause\n",
+      "     |  \n",
+      "     |  __context__\n",
+      "     |      exception context\n",
+      "     |  \n",
+      "     |  __dict__\n",
+      "     |  \n",
+      "     |  __suppress_context__\n",
+      "     |  \n",
+      "     |  __traceback__\n",
+      "     |  \n",
+      "     |  args\n",
+      "\n",
+      "FUNCTIONS\n",
+      "    compile(pattern, flags=0)\n",
+      "        Compile a regular expression pattern, returning a Pattern object.\n",
+      "    \n",
+      "    escape(pattern)\n",
+      "        Escape special characters in a string.\n",
+      "    \n",
+      "    findall(pattern, string, flags=0)\n",
+      "        Return a list of all non-overlapping matches in the string.\n",
+      "        \n",
+      "        If one or more capturing groups are present in the pattern, return\n",
+      "        a list of groups; this will be a list of tuples if the pattern\n",
+      "        has more than one group.\n",
+      "        \n",
+      "        Empty matches are included in the result.\n",
+      "    \n",
+      "    finditer(pattern, string, flags=0)\n",
+      "        Return an iterator over all non-overlapping matches in the\n",
+      "        string.  For each match, the iterator returns a Match object.\n",
+      "        \n",
+      "        Empty matches are included in the result.\n",
+      "    \n",
+      "    fullmatch(pattern, string, flags=0)\n",
+      "        Try to apply the pattern to all of the string, returning\n",
+      "        a Match object, or None if no match was found.\n",
+      "    \n",
+      "    match(pattern, string, flags=0)\n",
+      "        Try to apply the pattern at the start of the string, returning\n",
+      "        a Match object, or None if no match was found.\n",
+      "    \n",
+      "    purge()\n",
+      "        Clear the regular expression caches\n",
+      "    \n",
+      "    search(pattern, string, flags=0)\n",
+      "        Scan through string looking for a match to the pattern, returning\n",
+      "        a Match object, or None if no match was found.\n",
+      "    \n",
+      "    split(pattern, string, maxsplit=0, flags=0)\n",
+      "        Split the source string by the occurrences of the pattern,\n",
+      "        returning a list containing the resulting substrings.  If\n",
+      "        capturing parentheses are used in pattern, then the text of all\n",
+      "        groups in the pattern are also returned as part of the resulting\n",
+      "        list.  If maxsplit is nonzero, at most maxsplit splits occur,\n",
+      "        and the remainder of the string is returned as the final element\n",
+      "        of the list.\n",
+      "    \n",
+      "    sub(pattern, repl, string, count=0, flags=0)\n",
+      "        Return the string obtained by replacing the leftmost\n",
+      "        non-overlapping occurrences of the pattern in string by the\n",
+      "        replacement repl.  repl can be either a string or a callable;\n",
+      "        if a string, backslash escapes in it are processed.  If it is\n",
+      "        a callable, it's passed the Match object and must return\n",
+      "        a replacement string to be used.\n",
+      "    \n",
+      "    subn(pattern, repl, string, count=0, flags=0)\n",
+      "        Return a 2-tuple containing (new_string, number).\n",
+      "        new_string is the string obtained by replacing the leftmost\n",
+      "        non-overlapping occurrences of the pattern in the source\n",
+      "        string by the replacement repl.  number is the number of\n",
+      "        substitutions that were made. repl can be either a string or a\n",
+      "        callable; if a string, backslash escapes in it are processed.\n",
+      "        If it is a callable, it's passed the Match object and must\n",
+      "        return a replacement string to be used.\n",
+      "    \n",
+      "    template(pattern, flags=0)\n",
+      "        Compile a template pattern, returning a Pattern object\n",
+      "\n",
+      "DATA\n",
+      "    A = re.ASCII\n",
+      "    ASCII = re.ASCII\n",
+      "    DOTALL = re.DOTALL\n",
+      "    I = re.IGNORECASE\n",
+      "    IGNORECASE = re.IGNORECASE\n",
+      "    L = re.LOCALE\n",
+      "    LOCALE = re.LOCALE\n",
+      "    M = re.MULTILINE\n",
+      "    MULTILINE = re.MULTILINE\n",
+      "    S = re.DOTALL\n",
+      "    U = re.UNICODE\n",
+      "    UNICODE = re.UNICODE\n",
+      "    VERBOSE = re.VERBOSE\n",
+      "    X = re.VERBOSE\n",
+      "    __all__ = ['match', 'fullmatch', 'search', 'sub', 'subn', 'split', 'fi...\n",
+      "\n",
+      "VERSION\n",
+      "    2.2.1\n",
+      "\n",
+      "FILE\n",
+      "    c:\\users\\josev\\appdata\\local\\programs\\python\\python310\\lib\\re.py\n",
+      "\n",
+      "\n"
+     ]
+    }
+   ],
+   "source": [
+    "help(re)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 75,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['Some', 'say', 'the', 'world', 'will', 'end', 'in', 'fire', 'Some', 'say', 'in', 'ice', 'From', 'what', 'I’ve', 'tasted', 'of', 'desire', 'I', 'hold', 'with', 'those', 'who', 'favor', 'fire', 'But', 'if', 'it', 'had', 'to', 'perish', 'twice', 'I', 'think', 'I', 'know', 'enough', 'of', 'hate', 'To', 'say', 'that', 'for', 'destruction', 'ice', 'Is', 'also', 'great', 'And', 'would', 'suffice']\n"
+     ]
+    }
+   ],
+   "source": [
+    "# split the string into a list of strings using the space delimiter\n",
+    "string_list = re.split(\"[,.\\s\\n\\r]\", poem)\n",
+    "\n",
+    "string_list = [word for word in string_list if word != '']\n",
+    "print(string_list)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 45,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# Count the frequency of each word in the string in a dictionary. \n",
+    "# Strip the periods, line breaks and commas from the text. \n",
+    "# Make sure to remove empty strings from your dictionary."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 79,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "{'Some': 2, 'say': 3, 'the': 1, 'world': 1, 'will': 1, 'end': 1, 'in': 2, 'fire': 2, 'ice': 2, 'From': 1, 'what': 1, 'I’ve': 1, 'tasted': 1, 'of': 2, 'desire': 1, 'I': 3, 'hold': 1, 'with': 1, 'those': 1, 'who': 1, 'favor': 1, 'But': 1, 'if': 1, 'it': 1, 'had': 1, 'to': 1, 'perish': 1, 'twice': 1, 'think': 1, 'know': 1, 'enough': 1, 'hate': 1, 'To': 1, 'that': 1, 'for': 1, 'destruction': 1, 'Is': 1, 'also': 1, 'great': 1, 'And': 1, 'would': 1, 'suffice': 1}\n"
+     ]
+    }
+   ],
+   "source": [
+    "dict_of_counts = {item:string_list.count(item) for item in string_list}\n",
+    "print(dict_of_counts)"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -132,7 +782,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 80,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -161,6 +811,64 @@
     "# Your code here:\n"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 81,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "'i was angry with my friend; \\ni told my wrath, my wrath did end.\\ni was angry with my foe: \\ni told it not, my wrath did grow. \\n\\nand i waterd it in fears,\\nnight & morning with my tears: \\nand i sunned it with smiles,\\nand with soft deceitful wiles. \\n\\nand it grew both day and night. \\ntill it bore an apple bright. \\nand my foe beheld it shine,\\nand he knew that it was mine. \\n\\nand into my garden stole, \\nwhen the night had veild the pole; \\nin the morning glad i see; \\nmy foe outstretched beneath the tree.'"
+      ]
+     },
+     "execution_count": 81,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "poem = poem.lower()\n",
+    "poem"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 83,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['i', 'was', 'angry', 'with', 'my', 'friend', 'i', 'told', 'my', 'wrath', 'my', 'wrath', 'did', 'end', 'i', 'was', 'angry', 'with', 'my', 'foe', 'i', 'told', 'it', 'not', 'my', 'wrath', 'did', 'grow', 'and', 'i', 'waterd', 'it', 'in', 'fears', 'night', '&', 'morning', 'with', 'my', 'tears', 'and', 'i', 'sunned', 'it', 'with', 'smiles', 'and', 'with', 'soft', 'deceitful', 'wiles', 'and', 'it', 'grew', 'both', 'day', 'and', 'night', 'till', 'it', 'bore', 'an', 'apple', 'bright', 'and', 'my', 'foe', 'beheld', 'it', 'shine', 'and', 'he', 'knew', 'that', 'it', 'was', 'mine', 'and', 'into', 'my', 'garden', 'stole', 'when', 'the', 'night', 'had', 'veild', 'the', 'pole', 'in', 'the', 'morning', 'glad', 'i', 'see', 'my', 'foe', 'outstretched', 'beneath', 'the', 'tree']\n"
+     ]
+    }
+   ],
+   "source": [
+    "string_list = re.split(\"[,.;:\\s\\n\\r]\", poem)\n",
+    "string_list = [word for word in string_list if word != '']\n",
+    "print(string_list)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 85,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['i', 'was', 'angry', 'with', 'my', 'friend', 'i', 'told', 'my', 'wrath', 'my', 'wrath', 'did', 'end', 'i', 'was', 'angry', 'with', 'my', 'foe', 'i', 'told', 'not', 'my', 'wrath', 'did', 'grow', 'i', 'waterd', 'fears', 'night', '&', 'morning', 'with', 'my', 'tears', 'i', 'sunned', 'with', 'smiles', 'with', 'soft', 'deceitful', 'wiles', 'grew', 'both', 'day', 'night', 'till', 'bore', 'apple', 'bright', 'my', 'foe', 'beheld', 'shine', 'he', 'knew', 'that', 'was', 'mine', 'into', 'my', 'garden', 'stole', 'when', 'night', 'had', 'veild', 'pole', 'morning', 'glad', 'i', 'see', 'my', 'foe', 'outstretched', 'beneath', 'tree']\n"
+     ]
+    }
+   ],
+   "source": [
+    "string_list = [word for word in string_list if word not in blacklist]\n",
+    "print(string_list)"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -172,7 +880,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 86,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -182,6 +890,25 @@
     "# Your code here:\n"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 96,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['T', 'P']\n"
+     ]
+    }
+   ],
+   "source": [
+    "letters_list = re.split(r\"[a-z.,;: \\s]\", poem)\n",
+    "letters_list = [word for word in letters_list if word != '']\n",
+    "print(letters_list)"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -191,7 +918,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 97,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -200,6 +927,24 @@
     "# Your code here:\n"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 154,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['123abc', 'abc123', 'JohnSmith1', 'ABBY4']\n"
+     ]
+    }
+   ],
+   "source": [
+    "data = [word for word in data if re.search(r'[\\d.+?]', word) != None]\n",
+    "print(data)"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -213,18 +958,43 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 155,
    "metadata": {},
    "outputs": [],
    "source": [
     "data = ['123abc', 'abc123', 'JohnSmith1', 'ABBY4', 'JANE']\n",
     "# Your code here:\n"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 156,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['123abc', 'abc123', 'JohnSmith1']\n"
+     ]
+    }
+   ],
+   "source": [
+    "data = [word for word in data if re.search(r'(?=.*\\d)(?=.*[a-z])', word) != None]\n",
+    "print(data)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -238,7 +1008,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.2"
+   "version": "3.10.3"
   }
  },
  "nbformat": 4,
diff --git a/your-code/challenge-2.ipynb b/your-code/challenge-2.ipynb
index d76069e..cedc6fa 100644
--- a/your-code/challenge-2.ipynb
+++ b/your-code/challenge-2.ipynb
@@ -72,7 +72,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 1,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -88,13 +88,30 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 2,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['Ironhack is cool.', 'I love Ironhack.', 'I am a student at Ironhack.']"
+      ]
+     },
+     "execution_count": 2,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "corpus = []\n",
     "\n",
-    "# Write your code here\n"
+    "# Write your code here\n",
+    "for i in range(1,4):\n",
+    "    with open(f'doc{i}.txt', 'r') as file:\n",
+    "        data = file.read().rstrip() # valid only if text in file is a single line\n",
+    "        corpus += [data]\n",
+    "\n",
+    "corpus"
    ]
   },
   {
@@ -106,9 +123,17 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 3,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['Ironhack is cool.', 'I love Ironhack.', 'I am a student at Ironhack.']\n"
+     ]
+    }
+   ],
    "source": [
     "print(corpus)"
    ]
@@ -136,11 +161,31 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 4,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['ironhack is cool', 'i love ironhack', 'i am a student at ironhack']"
+      ]
+     },
+     "execution_count": 4,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
-    "# Write your code here"
+    "# Write your code here\n",
+    "punc = '''!()-[]{};:'\"\\,<>./?@#$%^&*_~'''\n",
+    "\n",
+    "for string in corpus:\n",
+    "    if string.endswith(\".\") == True:\n",
+    "        string = string.replace(\".\", \"\")\n",
+    "        corpus += [string.lower()]\n",
+    "    \n",
+    "corpus = corpus[3:6]\n",
+    "corpus"
    ]
   },
   {
@@ -152,7 +197,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 5,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -172,11 +217,105 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 6,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['ironhack is cool', 'i love ironhack', 'i am a student at ironhack']"
+      ]
+     },
+     "execution_count": 6,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
-    "# Write your code here"
+    "corpus"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 21,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[['ironhack', 'is', 'cool'],\n",
+       " ['i', 'love', 'ironhack'],\n",
+       " ['i', 'am', 'a', 'student', 'at', 'ironhack']]"
+      ]
+     },
+     "execution_count": 21,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "import re\n",
+    "corpus = [re.split(\"[,.;:\\s\\n\\r]\", string) for string in corpus]\n",
+    "corpus"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 51,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['ironhack',\n",
+       " 'is',\n",
+       " 'cool',\n",
+       " 'i',\n",
+       " 'love',\n",
+       " 'ironhack',\n",
+       " 'i',\n",
+       " 'am',\n",
+       " 'a',\n",
+       " 'student',\n",
+       " 'at',\n",
+       " 'ironhack']"
+      ]
+     },
+     "execution_count": 51,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "bag_of_words = [string for lista in corpus for string in lista]\n",
+    "bag_of_words"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 53,
+   "metadata": {},
+   "outputs": [
+    {
+     "ename": "TypeError",
+     "evalue": "argument of type 'NoneType' is not iterable",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
+      "\u001b[1;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
+      "Input \u001b[1;32mIn [53]\u001b[0m, in \u001b[0;36m<cell line: 2>\u001b[1;34m()\u001b[0m\n\u001b[0;32m      2\u001b[0m \u001b[38;5;28;01mfor\u001b[39;00m lista \u001b[38;5;129;01min\u001b[39;00m corpus:\n\u001b[0;32m      3\u001b[0m     \u001b[38;5;28;01mfor\u001b[39;00m string \u001b[38;5;129;01min\u001b[39;00m lista:\n\u001b[1;32m----> 4\u001b[0m         \u001b[38;5;28;01mif\u001b[39;00m \u001b[43mstring\u001b[49m\u001b[43m \u001b[49m\u001b[38;5;129;43;01min\u001b[39;49;00m\u001b[43m \u001b[49m\u001b[43mbag_of_words\u001b[49m:\n\u001b[0;32m      5\u001b[0m             bag_of_words \u001b[38;5;241m=\u001b[39m bag_of_words\u001b[38;5;241m.\u001b[39mappend(word)\n\u001b[0;32m      7\u001b[0m bag_of_words\n",
+      "\u001b[1;31mTypeError\u001b[0m: argument of type 'NoneType' is not iterable"
+     ]
+    }
+   ],
+   "source": [
+    "# Write your code here\n",
+    "for lista in corpus:\n",
+    "    for string in lista:\n",
+    "        if string in bag_of_words:\n",
+    "            bag_of_words = bag_of_words.append(word)\n",
+    "\n",
+    "bag_of_words"
    ]
   },
   {
@@ -192,9 +331,17 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 8,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[]\n"
+     ]
+    }
+   ],
    "source": [
     "print(bag_of_words)"
    ]
@@ -208,7 +355,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 9,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -228,9 +375,17 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 10,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[]\n"
+     ]
+    }
+   ],
    "source": [
     "print(term_freq)"
    ]
@@ -268,7 +423,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 11,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -309,7 +464,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -323,7 +478,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.3"
+   "version": "3.10.3"
   }
  },
  "nbformat": 4,

From ae6620e2fa5971de588ba52d07ca4416ab5d19e7 Mon Sep 17 00:00:00 2001
From: JoseVelazquezR <jose.velazquez.r@outlook.com>
Date: Mon, 28 Mar 2022 23:01:06 -0600
Subject: [PATCH 2/2] Laboratorio corregido

---
 .../challenge-2-checkpoint.ipynb              | 296 +++++++++++-------
 your-code/challenge-1.ipynb                   |  48 +--
 your-code/challenge-2.ipynb                   | 296 +++++++++++-------
 3 files changed, 402 insertions(+), 238 deletions(-)

diff --git a/your-code/.ipynb_checkpoints/challenge-2-checkpoint.ipynb b/your-code/.ipynb_checkpoints/challenge-2-checkpoint.ipynb
index cedc6fa..b8cb010 100644
--- a/your-code/.ipynb_checkpoints/challenge-2-checkpoint.ipynb
+++ b/your-code/.ipynb_checkpoints/challenge-2-checkpoint.ipynb
@@ -72,7 +72,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": 2,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -88,7 +88,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": 3,
    "metadata": {},
    "outputs": [
     {
@@ -97,7 +97,7 @@
        "['Ironhack is cool.', 'I love Ironhack.', 'I am a student at Ironhack.']"
       ]
      },
-     "execution_count": 2,
+     "execution_count": 3,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -109,6 +109,7 @@
     "for i in range(1,4):\n",
     "    with open(f'doc{i}.txt', 'r') as file:\n",
     "        data = file.read().rstrip() # valid only if text in file is a single line\n",
+    "                            #rstrip() reads from the RIGHT\n",
     "        corpus += [data]\n",
     "\n",
     "corpus"
@@ -123,7 +124,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 4,
    "metadata": {},
    "outputs": [
     {
@@ -161,7 +162,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 5,
    "metadata": {},
    "outputs": [
     {
@@ -170,7 +171,7 @@
        "['ironhack is cool', 'i love ironhack', 'i am a student at ironhack']"
       ]
      },
-     "execution_count": 4,
+     "execution_count": 5,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -197,7 +198,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 6,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -217,103 +218,47 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": 7,
    "metadata": {},
-   "outputs": [
-    {
-     "data": {
-      "text/plain": [
-       "['ironhack is cool', 'i love ironhack', 'i am a student at ironhack']"
-      ]
-     },
-     "execution_count": 6,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
+   "outputs": [],
    "source": [
-    "corpus"
+    "# import re\n",
+    "# corpus = [re.split(\"[,.;:\\s\\n\\r]\", string) for string in corpus]\n",
+    "# corpus"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 21,
+   "execution_count": 8,
    "metadata": {},
    "outputs": [
     {
-     "data": {
-      "text/plain": [
-       "[['ironhack', 'is', 'cool'],\n",
-       " ['i', 'love', 'ironhack'],\n",
-       " ['i', 'am', 'a', 'student', 'at', 'ironhack']]"
-      ]
-     },
-     "execution_count": 21,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
-   "source": [
-    "import re\n",
-    "corpus = [re.split(\"[,.;:\\s\\n\\r]\", string) for string in corpus]\n",
-    "corpus"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 51,
-   "metadata": {},
-   "outputs": [
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['ironhack', 'is', 'cool']\n",
+      "['i', 'love', 'ironhack']\n",
+      "['i', 'am', 'a', 'student', 'at', 'ironhack']\n"
+     ]
+    },
     {
      "data": {
       "text/plain": [
-       "['ironhack',\n",
-       " 'is',\n",
-       " 'cool',\n",
-       " 'i',\n",
-       " 'love',\n",
-       " 'ironhack',\n",
-       " 'i',\n",
-       " 'am',\n",
-       " 'a',\n",
-       " 'student',\n",
-       " 'at',\n",
-       " 'ironhack']"
+       "['ironhack', 'is', 'cool', 'i', 'love', 'am', 'a', 'student', 'at']"
       ]
      },
-     "execution_count": 51,
+     "execution_count": 8,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
    "source": [
-    "bag_of_words = [string for lista in corpus for string in lista]\n",
-    "bag_of_words"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 53,
-   "metadata": {},
-   "outputs": [
-    {
-     "ename": "TypeError",
-     "evalue": "argument of type 'NoneType' is not iterable",
-     "output_type": "error",
-     "traceback": [
-      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
-      "\u001b[1;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
-      "Input \u001b[1;32mIn [53]\u001b[0m, in \u001b[0;36m<cell line: 2>\u001b[1;34m()\u001b[0m\n\u001b[0;32m      2\u001b[0m \u001b[38;5;28;01mfor\u001b[39;00m lista \u001b[38;5;129;01min\u001b[39;00m corpus:\n\u001b[0;32m      3\u001b[0m     \u001b[38;5;28;01mfor\u001b[39;00m string \u001b[38;5;129;01min\u001b[39;00m lista:\n\u001b[1;32m----> 4\u001b[0m         \u001b[38;5;28;01mif\u001b[39;00m \u001b[43mstring\u001b[49m\u001b[43m \u001b[49m\u001b[38;5;129;43;01min\u001b[39;49;00m\u001b[43m \u001b[49m\u001b[43mbag_of_words\u001b[49m:\n\u001b[0;32m      5\u001b[0m             bag_of_words \u001b[38;5;241m=\u001b[39m bag_of_words\u001b[38;5;241m.\u001b[39mappend(word)\n\u001b[0;32m      7\u001b[0m bag_of_words\n",
-      "\u001b[1;31mTypeError\u001b[0m: argument of type 'NoneType' is not iterable"
-     ]
-    }
-   ],
-   "source": [
-    "# Write your code here\n",
-    "for lista in corpus:\n",
-    "    for string in lista:\n",
-    "        if string in bag_of_words:\n",
-    "            bag_of_words = bag_of_words.append(word)\n",
+    "for doc in corpus:\n",
+    "    words = doc.split()\n",
+    "    print(words)\n",
+    "    for word in words:\n",
+    "        if word not in bag_of_words:\n",
+    "            bag_of_words.append(word)\n",
     "\n",
     "bag_of_words"
    ]
@@ -329,23 +274,6 @@
     "If not, fix your code in the previous cell."
    ]
   },
-  {
-   "cell_type": "code",
-   "execution_count": 8,
-   "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "[]\n"
-     ]
-    }
-   ],
-   "source": [
-    "print(bag_of_words)"
-   ]
-  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -357,11 +285,31 @@
    "cell_type": "code",
    "execution_count": 9,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[1, 1, 1, 0, 0, 0, 0, 0, 0]\n",
+      "[1, 0, 0, 1, 1, 0, 0, 0, 0]\n",
+      "[1, 0, 0, 1, 0, 1, 1, 1, 1]\n",
+      "[[1, 1, 1, 0, 0, 0, 0, 0, 0], [1, 0, 0, 1, 1, 0, 0, 0, 0], [1, 0, 0, 1, 0, 1, 1, 1, 1]]\n"
+     ]
+    }
+   ],
    "source": [
     "term_freq = []\n",
     "\n",
-    "# Write your code here"
+    "# Write your code here\n",
+    "\n",
+    "for i in range(len(corpus)):\n",
+    "    temp_list =[]\n",
+    "    for word in bag_of_words:\n",
+    "        conteo = corpus[i].split().count(word)\n",
+    "        temp_list.append(conteo)\n",
+    "    print(temp_list)\n",
+    "    term_freq.append(temp_list)\n",
+    "print(term_freq)"
    ]
   },
   {
@@ -382,7 +330,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "[]\n"
+      "[[1, 1, 1, 0, 0, 0, 0, 0, 0], [1, 0, 0, 1, 1, 0, 0, 0, 0], [1, 0, 0, 1, 0, 1, 1, 1, 1]]\n"
      ]
     }
    ],
@@ -425,13 +373,70 @@
    "cell_type": "code",
    "execution_count": 11,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['all', 'six', 'less', 'being', 'indeed', 'over', 'move', 'anyway', 'fifty', 'four', 'not', 'own', 'through', 'yourselves', 'go', 'where', 'mill', 'only', 'find', 'before', 'one', 'whose', 'system', 'how', 'somewhere', 'with', 'thick', 'show', 'had', 'enough', 'should', 'to', 'must', 'whom', 'seeming', 'under', 'ours', 'has', 'might', 'thereafter', 'latterly', 'do', 'them', 'his', 'around', 'than', 'get', 'very', 'de', 'none', 'cannot', 'every', 'whether', 'they', 'front', 'during', 'thus', 'now', 'him', 'nor', 'name', 'several', 'hereafter', 'always', 'who', 'cry', 'whither', 'this', 'someone', 'either', 'each', 'become', 'thereupon', 'sometime', 'side', 'two', 'therein', 'twelve', 'because', 'often', 'ten', 'our', 'eg', 'some', 'back', 'up', 'namely', 'towards', 'are', 'further', 'beyond', 'ourselves', 'yet', 'out', 'even', 'will', 'what', 'still', 'for', 'bottom', 'mine', 'since', 'please', 'forty', 'per', 'its', 'everything', 'behind', 'un', 'above', 'between', 'it', 'neither', 'seemed', 'ever', 'across', 'she', 'somehow', 'be', 'we', 'full', 'never', 'sixty', 'however', 'here', 'otherwise', 'were', 'whereupon', 'nowhere', 'although', 'found', 'alone', 're', 'along', 'fifteen', 'by', 'both', 'about', 'last', 'would', 'anything', 'via', 'many', 'could', 'thence', 'put', 'against', 'keep', 'etc', 'amount', 'became', 'ltd', 'hence', 'onto', 'or', 'con', 'among', 'already', 'co', 'afterwards', 'formerly', 'within', 'seems', 'into', 'others', 'while', 'whatever', 'except', 'down', 'hers', 'everyone', 'done', 'least', 'another', 'whoever', 'moreover', 'couldnt', 'throughout', 'anyhow', 'yourself', 'three', 'from', 'her', 'few', 'together', 'top', 'there', 'due', 'been', 'next', 'anyone', 'eleven', 'much', 'call', 'therefore', 'interest', 'then', 'thru', 'themselves', 'hundred', 'was', 'sincere', 'empty', 'more', 'himself', 'elsewhere', 'mostly', 'on', 'fire', 'am', 'becoming', 'hereby', 'amongst', 'else', 'part', 'everywhere', 'too', 'herself', 'former', 'those', 'he', 'me', 'myself', 'made', 'twenty', 'these', 'bill', 'cant', 'us', 'until', 'besides', 'nevertheless', 'below', 'anywhere', 'nine', 'can', 'of', 'your', 'toward', 'my', 'something', 'and', 'whereafter', 'whenever', 'give', 'almost', 'wherever', 'is', 'describe', 'beforehand', 'herein', 'an', 'as', 'itself', 'at', 'have', 'in', 'seem', 'whence', 'ie', 'any', 'fill', 'again', 'hasnt', 'inc', 'thereby', 'thin', 'no', 'perhaps', 'latter', 'meanwhile', 'when', 'detail', 'same', 'wherein', 'beside', 'also', 'that', 'other', 'take', 'which', 'becomes', 'you', 'if', 'nobody', 'see', 'though', 'may', 'after', 'upon', 'most', 'hereupon', 'eight', 'but', 'serious', 'nothing', 'such', 'why', 'a', 'off', 'whereby', 'third', 'i', 'whole', 'noone', 'sometimes', 'well', 'amoungst', 'yours', 'their', 'rather', 'without', 'so', 'five', 'the', 'first', 'whereas', 'once']\n"
+     ]
+    }
+   ],
    "source": [
     "stop_words = ['all', 'six', 'less', 'being', 'indeed', 'over', 'move', 'anyway', 'fifty', 'four', 'not', 'own', 'through', 'yourselves', 'go', 'where', 'mill', 'only', 'find', 'before', 'one', 'whose', 'system', 'how', 'somewhere', 'with', 'thick', 'show', 'had', 'enough', 'should', 'to', 'must', 'whom', 'seeming', 'under', 'ours', 'has', 'might', 'thereafter', 'latterly', 'do', 'them', 'his', 'around', 'than', 'get', 'very', 'de', 'none', 'cannot', 'every', 'whether', 'they', 'front', 'during', 'thus', 'now', 'him', 'nor', 'name', 'several', 'hereafter', 'always', 'who', 'cry', 'whither', 'this', 'someone', 'either', 'each', 'become', 'thereupon', 'sometime', 'side', 'two', 'therein', 'twelve', 'because', 'often', 'ten', 'our', 'eg', 'some', 'back', 'up', 'namely', 'towards', 'are', 'further', 'beyond', 'ourselves', 'yet', 'out', 'even', 'will', 'what', 'still', 'for', 'bottom', 'mine', 'since', 'please', 'forty', 'per', 'its', 'everything', 'behind', 'un', 'above', 'between', 'it', 'neither', 'seemed', 'ever', 'across', 'she', 'somehow', 'be', 'we', 'full', 'never', 'sixty', 'however', 'here', 'otherwise', 'were', 'whereupon', 'nowhere', 'although', 'found', 'alone', 're', 'along', 'fifteen', 'by', 'both', 'about', 'last', 'would', 'anything', 'via', 'many', 'could', 'thence', 'put', 'against', 'keep', 'etc', 'amount', 'became', 'ltd', 'hence', 'onto', 'or', 'con', 'among', 'already', 'co', 'afterwards', 'formerly', 'within', 'seems', 'into', 'others', 'while', 'whatever', 'except', 'down', 'hers', 'everyone', 'done', 'least', 'another', 'whoever', 'moreover', 'couldnt', 'throughout', 'anyhow', 'yourself', 'three', 'from', 'her', 'few', 'together', 'top', 'there', 'due', 'been', 'next', 'anyone', 'eleven', 'much', 'call', 'therefore', 'interest', 'then', 'thru', 'themselves', 'hundred', 'was', 'sincere', 'empty', 'more', 'himself', 'elsewhere', 'mostly', 'on', 'fire', 'am', 'becoming', 'hereby', 'amongst', 'else', 'part', 'everywhere', 'too', 'herself', 'former', 'those', 'he', 'me', 'myself', 'made', 'twenty', 'these', 'bill', 'cant', 'us', 'until', 'besides', 'nevertheless', 'below', 'anywhere', 'nine', 'can', 'of', 'your', 'toward', 'my', 'something', 'and', 'whereafter', 'whenever', 'give', 'almost', 'wherever', 'is', 'describe', 'beforehand', 'herein', 'an', 'as', 'itself', 'at', 'have', 'in', 'seem', 'whence', 'ie', 'any', 'fill', 'again', 'hasnt', 'inc', 'thereby', 'thin', 'no', 'perhaps', 'latter', 'meanwhile', 'when', 'detail', 'same', 'wherein', 'beside', 'also', 'that', 'other', 'take', 'which', 'becomes', 'you', 'if', 'nobody', 'see', 'though', 'may', 'after', 'upon', 'most', 'hereupon', 'eight', 'but', 'serious', 'nothing', 'such', 'why', 'a', 'off', 'whereby', 'third', 'i', 'whole', 'noone', 'sometimes', 'well', 'amoungst', 'yours', 'their', 'rather', 'without', 'so', 'five', 'the', 'first', 'whereas', 'once']\n",
-    "\n",
+    "print(stop_words)\n",
     "# Write your code below\n"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['ironhack', 'cool', 'love', 'student']"
+      ]
+     },
+     "execution_count": 12,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "bag_of_words = [word for word in bag_of_words if word not in stop_words]\n",
+    "bag_of_words"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 13,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[1, 1, 0, 0]\n",
+      "[1, 0, 1, 0]\n",
+      "[1, 0, 0, 1]\n",
+      "[[1, 1, 0, 0], [1, 0, 1, 0], [1, 0, 0, 1]]\n"
+     ]
+    }
+   ],
+   "source": [
+    "term_freq = []\n",
+    "for i in range(len(corpus)):\n",
+    "    temp_list =[]\n",
+    "    for word in bag_of_words:\n",
+    "        conteo = corpus[i].split().count(word)\n",
+    "        temp_list.append(conteo)\n",
+    "    print(temp_list)\n",
+    "    term_freq.append(temp_list)\n",
+    "print(term_freq)"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -460,6 +465,83 @@
     " [1 1 0 1 0 0 1]]\n",
     " ```"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 14,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['ironhack is cool', 'i love ironhack', 'i am a student at ironhack']\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(corpus)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 15,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from sklearn.feature_extraction.text import CountVectorizer"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 16,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[[0 0 1 1 1 0 0]\n",
+      " [0 0 0 1 0 1 0]\n",
+      " [1 1 0 1 0 0 1]]\n",
+      "{'ironhack': 3, 'is': 4, 'cool': 2, 'love': 5, 'am': 0, 'student': 6, 'at': 1}\n"
+     ]
+    }
+   ],
+   "source": [
+    "vector = CountVectorizer()\n",
+    "print(vector.fit_transform(corpus).todense())\n",
+    "print(vector.vocabulary_)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 17,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[[1 1 0 0]\n",
+      " [0 1 1 0]\n",
+      " [0 1 0 1]]\n",
+      "{'ironhack': 1, 'cool': 0, 'love': 2, 'student': 3}\n"
+     ]
+    }
+   ],
+   "source": [
+    "vector = CountVectorizer(stop_words = \"english\")\n",
+    "print(vector.fit_transform(corpus).todense())\n",
+    "print(vector.vocabulary_)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {
diff --git a/your-code/challenge-1.ipynb b/your-code/challenge-1.ipynb
index 0859d23..3da4c22 100644
--- a/your-code/challenge-1.ipynb
+++ b/your-code/challenge-1.ipynb
@@ -15,7 +15,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": 4,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -33,7 +33,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 5,
    "metadata": {},
    "outputs": [
     {
@@ -42,7 +42,7 @@
        "'Durante un tiempo no estuvo segura de si su marido era su marido.'"
       ]
      },
-     "execution_count": 3,
+     "execution_count": 5,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -62,7 +62,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 24,
+   "execution_count": 6,
    "metadata": {},
    "outputs": [
     {
@@ -77,7 +77,7 @@
        " 'broccoli']"
       ]
      },
-     "execution_count": 24,
+     "execution_count": 6,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -92,7 +92,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 77,
+   "execution_count": 7,
    "metadata": {},
    "outputs": [
     {
@@ -101,7 +101,7 @@
        "'bananas chocolate bread diapers ice cream brownie mix broccoli'"
       ]
      },
-     "execution_count": 77,
+     "execution_count": 7,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -114,7 +114,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 31,
+   "execution_count": 8,
    "metadata": {},
    "outputs": [
     {
@@ -123,7 +123,7 @@
        "['bananas', 'bread', 'brownie', 'broccoli']"
       ]
      },
-     "execution_count": 31,
+     "execution_count": 8,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -136,7 +136,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 33,
+   "execution_count": 9,
    "metadata": {},
    "outputs": [
     {
@@ -145,7 +145,7 @@
        "'bananas, bread, brownie, broccoli.'"
       ]
      },
-     "execution_count": 33,
+     "execution_count": 9,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -166,7 +166,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 35,
+   "execution_count": 10,
    "metadata": {},
    "outputs": [
     {
@@ -175,7 +175,7 @@
        "78.53981633974483"
       ]
      },
-     "execution_count": 35,
+     "execution_count": 10,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -234,7 +234,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 41,
+   "execution_count": 11,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -725,14 +725,14 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 75,
+   "execution_count": 13,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "['Some', 'say', 'the', 'world', 'will', 'end', 'in', 'fire', 'Some', 'say', 'in', 'ice', 'From', 'what', 'I’ve', 'tasted', 'of', 'desire', 'I', 'hold', 'with', 'those', 'who', 'favor', 'fire', 'But', 'if', 'it', 'had', 'to', 'perish', 'twice', 'I', 'think', 'I', 'know', 'enough', 'of', 'hate', 'To', 'say', 'that', 'for', 'destruction', 'ice', 'Is', 'also', 'great', 'And', 'would', 'suffice']\n"
+      "['some', 'say', 'the', 'world', 'will', 'end', 'in', 'fire', 'some', 'say', 'in', 'ice', 'from', 'what', 'i’ve', 'tasted', 'of', 'desire', 'i', 'hold', 'with', 'those', 'who', 'favor', 'fire', 'but', 'if', 'it', 'had', 'to', 'perish', 'twice', 'i', 'think', 'i', 'know', 'enough', 'of', 'hate', 'to', 'say', 'that', 'for', 'destruction', 'ice', 'is', 'also', 'great', 'and', 'would', 'suffice']\n"
      ]
     }
    ],
@@ -740,7 +740,7 @@
     "# split the string into a list of strings using the space delimiter\n",
     "string_list = re.split(\"[,.\\s\\n\\r]\", poem)\n",
     "\n",
-    "string_list = [word for word in string_list if word != '']\n",
+    "string_list = [word.lower() for word in string_list if word != '']\n",
     "print(string_list)"
    ]
   },
@@ -757,14 +757,14 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 79,
+   "execution_count": 14,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "{'Some': 2, 'say': 3, 'the': 1, 'world': 1, 'will': 1, 'end': 1, 'in': 2, 'fire': 2, 'ice': 2, 'From': 1, 'what': 1, 'I’ve': 1, 'tasted': 1, 'of': 2, 'desire': 1, 'I': 3, 'hold': 1, 'with': 1, 'those': 1, 'who': 1, 'favor': 1, 'But': 1, 'if': 1, 'it': 1, 'had': 1, 'to': 1, 'perish': 1, 'twice': 1, 'think': 1, 'know': 1, 'enough': 1, 'hate': 1, 'To': 1, 'that': 1, 'for': 1, 'destruction': 1, 'Is': 1, 'also': 1, 'great': 1, 'And': 1, 'would': 1, 'suffice': 1}\n"
+      "{'some': 2, 'say': 3, 'the': 1, 'world': 1, 'will': 1, 'end': 1, 'in': 2, 'fire': 2, 'ice': 2, 'from': 1, 'what': 1, 'i’ve': 1, 'tasted': 1, 'of': 2, 'desire': 1, 'i': 3, 'hold': 1, 'with': 1, 'those': 1, 'who': 1, 'favor': 1, 'but': 1, 'if': 1, 'it': 1, 'had': 1, 'to': 2, 'perish': 1, 'twice': 1, 'think': 1, 'know': 1, 'enough': 1, 'hate': 1, 'that': 1, 'for': 1, 'destruction': 1, 'is': 1, 'also': 1, 'great': 1, 'and': 1, 'would': 1, 'suffice': 1}\n"
      ]
     }
    ],
@@ -782,7 +782,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 80,
+   "execution_count": 15,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -813,7 +813,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 81,
+   "execution_count": 16,
    "metadata": {},
    "outputs": [
     {
@@ -822,7 +822,7 @@
        "'i was angry with my friend; \\ni told my wrath, my wrath did end.\\ni was angry with my foe: \\ni told it not, my wrath did grow. \\n\\nand i waterd it in fears,\\nnight & morning with my tears: \\nand i sunned it with smiles,\\nand with soft deceitful wiles. \\n\\nand it grew both day and night. \\ntill it bore an apple bright. \\nand my foe beheld it shine,\\nand he knew that it was mine. \\n\\nand into my garden stole, \\nwhen the night had veild the pole; \\nin the morning glad i see; \\nmy foe outstretched beneath the tree.'"
       ]
      },
-     "execution_count": 81,
+     "execution_count": 16,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -880,7 +880,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 86,
+   "execution_count": 17,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -892,7 +892,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 96,
+   "execution_count": 18,
    "metadata": {},
    "outputs": [
     {
diff --git a/your-code/challenge-2.ipynb b/your-code/challenge-2.ipynb
index cedc6fa..b8cb010 100644
--- a/your-code/challenge-2.ipynb
+++ b/your-code/challenge-2.ipynb
@@ -72,7 +72,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": 2,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -88,7 +88,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": 3,
    "metadata": {},
    "outputs": [
     {
@@ -97,7 +97,7 @@
        "['Ironhack is cool.', 'I love Ironhack.', 'I am a student at Ironhack.']"
       ]
      },
-     "execution_count": 2,
+     "execution_count": 3,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -109,6 +109,7 @@
     "for i in range(1,4):\n",
     "    with open(f'doc{i}.txt', 'r') as file:\n",
     "        data = file.read().rstrip() # valid only if text in file is a single line\n",
+    "                            #rstrip() reads from the RIGHT\n",
     "        corpus += [data]\n",
     "\n",
     "corpus"
@@ -123,7 +124,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 4,
    "metadata": {},
    "outputs": [
     {
@@ -161,7 +162,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 5,
    "metadata": {},
    "outputs": [
     {
@@ -170,7 +171,7 @@
        "['ironhack is cool', 'i love ironhack', 'i am a student at ironhack']"
       ]
      },
-     "execution_count": 4,
+     "execution_count": 5,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -197,7 +198,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 6,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -217,103 +218,47 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": 7,
    "metadata": {},
-   "outputs": [
-    {
-     "data": {
-      "text/plain": [
-       "['ironhack is cool', 'i love ironhack', 'i am a student at ironhack']"
-      ]
-     },
-     "execution_count": 6,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
+   "outputs": [],
    "source": [
-    "corpus"
+    "# import re\n",
+    "# corpus = [re.split(\"[,.;:\\s\\n\\r]\", string) for string in corpus]\n",
+    "# corpus"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 21,
+   "execution_count": 8,
    "metadata": {},
    "outputs": [
     {
-     "data": {
-      "text/plain": [
-       "[['ironhack', 'is', 'cool'],\n",
-       " ['i', 'love', 'ironhack'],\n",
-       " ['i', 'am', 'a', 'student', 'at', 'ironhack']]"
-      ]
-     },
-     "execution_count": 21,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
-   "source": [
-    "import re\n",
-    "corpus = [re.split(\"[,.;:\\s\\n\\r]\", string) for string in corpus]\n",
-    "corpus"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 51,
-   "metadata": {},
-   "outputs": [
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['ironhack', 'is', 'cool']\n",
+      "['i', 'love', 'ironhack']\n",
+      "['i', 'am', 'a', 'student', 'at', 'ironhack']\n"
+     ]
+    },
     {
      "data": {
       "text/plain": [
-       "['ironhack',\n",
-       " 'is',\n",
-       " 'cool',\n",
-       " 'i',\n",
-       " 'love',\n",
-       " 'ironhack',\n",
-       " 'i',\n",
-       " 'am',\n",
-       " 'a',\n",
-       " 'student',\n",
-       " 'at',\n",
-       " 'ironhack']"
+       "['ironhack', 'is', 'cool', 'i', 'love', 'am', 'a', 'student', 'at']"
       ]
      },
-     "execution_count": 51,
+     "execution_count": 8,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
    "source": [
-    "bag_of_words = [string for lista in corpus for string in lista]\n",
-    "bag_of_words"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 53,
-   "metadata": {},
-   "outputs": [
-    {
-     "ename": "TypeError",
-     "evalue": "argument of type 'NoneType' is not iterable",
-     "output_type": "error",
-     "traceback": [
-      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
-      "\u001b[1;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
-      "Input \u001b[1;32mIn [53]\u001b[0m, in \u001b[0;36m<cell line: 2>\u001b[1;34m()\u001b[0m\n\u001b[0;32m      2\u001b[0m \u001b[38;5;28;01mfor\u001b[39;00m lista \u001b[38;5;129;01min\u001b[39;00m corpus:\n\u001b[0;32m      3\u001b[0m     \u001b[38;5;28;01mfor\u001b[39;00m string \u001b[38;5;129;01min\u001b[39;00m lista:\n\u001b[1;32m----> 4\u001b[0m         \u001b[38;5;28;01mif\u001b[39;00m \u001b[43mstring\u001b[49m\u001b[43m \u001b[49m\u001b[38;5;129;43;01min\u001b[39;49;00m\u001b[43m \u001b[49m\u001b[43mbag_of_words\u001b[49m:\n\u001b[0;32m      5\u001b[0m             bag_of_words \u001b[38;5;241m=\u001b[39m bag_of_words\u001b[38;5;241m.\u001b[39mappend(word)\n\u001b[0;32m      7\u001b[0m bag_of_words\n",
-      "\u001b[1;31mTypeError\u001b[0m: argument of type 'NoneType' is not iterable"
-     ]
-    }
-   ],
-   "source": [
-    "# Write your code here\n",
-    "for lista in corpus:\n",
-    "    for string in lista:\n",
-    "        if string in bag_of_words:\n",
-    "            bag_of_words = bag_of_words.append(word)\n",
+    "for doc in corpus:\n",
+    "    words = doc.split()\n",
+    "    print(words)\n",
+    "    for word in words:\n",
+    "        if word not in bag_of_words:\n",
+    "            bag_of_words.append(word)\n",
     "\n",
     "bag_of_words"
    ]
@@ -329,23 +274,6 @@
     "If not, fix your code in the previous cell."
    ]
   },
-  {
-   "cell_type": "code",
-   "execution_count": 8,
-   "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "[]\n"
-     ]
-    }
-   ],
-   "source": [
-    "print(bag_of_words)"
-   ]
-  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -357,11 +285,31 @@
    "cell_type": "code",
    "execution_count": 9,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[1, 1, 1, 0, 0, 0, 0, 0, 0]\n",
+      "[1, 0, 0, 1, 1, 0, 0, 0, 0]\n",
+      "[1, 0, 0, 1, 0, 1, 1, 1, 1]\n",
+      "[[1, 1, 1, 0, 0, 0, 0, 0, 0], [1, 0, 0, 1, 1, 0, 0, 0, 0], [1, 0, 0, 1, 0, 1, 1, 1, 1]]\n"
+     ]
+    }
+   ],
    "source": [
     "term_freq = []\n",
     "\n",
-    "# Write your code here"
+    "# Write your code here\n",
+    "\n",
+    "for i in range(len(corpus)):\n",
+    "    temp_list =[]\n",
+    "    for word in bag_of_words:\n",
+    "        conteo = corpus[i].split().count(word)\n",
+    "        temp_list.append(conteo)\n",
+    "    print(temp_list)\n",
+    "    term_freq.append(temp_list)\n",
+    "print(term_freq)"
    ]
   },
   {
@@ -382,7 +330,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "[]\n"
+      "[[1, 1, 1, 0, 0, 0, 0, 0, 0], [1, 0, 0, 1, 1, 0, 0, 0, 0], [1, 0, 0, 1, 0, 1, 1, 1, 1]]\n"
      ]
     }
    ],
@@ -425,13 +373,70 @@
    "cell_type": "code",
    "execution_count": 11,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['all', 'six', 'less', 'being', 'indeed', 'over', 'move', 'anyway', 'fifty', 'four', 'not', 'own', 'through', 'yourselves', 'go', 'where', 'mill', 'only', 'find', 'before', 'one', 'whose', 'system', 'how', 'somewhere', 'with', 'thick', 'show', 'had', 'enough', 'should', 'to', 'must', 'whom', 'seeming', 'under', 'ours', 'has', 'might', 'thereafter', 'latterly', 'do', 'them', 'his', 'around', 'than', 'get', 'very', 'de', 'none', 'cannot', 'every', 'whether', 'they', 'front', 'during', 'thus', 'now', 'him', 'nor', 'name', 'several', 'hereafter', 'always', 'who', 'cry', 'whither', 'this', 'someone', 'either', 'each', 'become', 'thereupon', 'sometime', 'side', 'two', 'therein', 'twelve', 'because', 'often', 'ten', 'our', 'eg', 'some', 'back', 'up', 'namely', 'towards', 'are', 'further', 'beyond', 'ourselves', 'yet', 'out', 'even', 'will', 'what', 'still', 'for', 'bottom', 'mine', 'since', 'please', 'forty', 'per', 'its', 'everything', 'behind', 'un', 'above', 'between', 'it', 'neither', 'seemed', 'ever', 'across', 'she', 'somehow', 'be', 'we', 'full', 'never', 'sixty', 'however', 'here', 'otherwise', 'were', 'whereupon', 'nowhere', 'although', 'found', 'alone', 're', 'along', 'fifteen', 'by', 'both', 'about', 'last', 'would', 'anything', 'via', 'many', 'could', 'thence', 'put', 'against', 'keep', 'etc', 'amount', 'became', 'ltd', 'hence', 'onto', 'or', 'con', 'among', 'already', 'co', 'afterwards', 'formerly', 'within', 'seems', 'into', 'others', 'while', 'whatever', 'except', 'down', 'hers', 'everyone', 'done', 'least', 'another', 'whoever', 'moreover', 'couldnt', 'throughout', 'anyhow', 'yourself', 'three', 'from', 'her', 'few', 'together', 'top', 'there', 'due', 'been', 'next', 'anyone', 'eleven', 'much', 'call', 'therefore', 'interest', 'then', 'thru', 'themselves', 'hundred', 'was', 'sincere', 'empty', 'more', 'himself', 'elsewhere', 'mostly', 'on', 'fire', 'am', 'becoming', 'hereby', 'amongst', 'else', 'part', 'everywhere', 'too', 'herself', 'former', 'those', 'he', 'me', 'myself', 'made', 'twenty', 'these', 'bill', 'cant', 'us', 'until', 'besides', 'nevertheless', 'below', 'anywhere', 'nine', 'can', 'of', 'your', 'toward', 'my', 'something', 'and', 'whereafter', 'whenever', 'give', 'almost', 'wherever', 'is', 'describe', 'beforehand', 'herein', 'an', 'as', 'itself', 'at', 'have', 'in', 'seem', 'whence', 'ie', 'any', 'fill', 'again', 'hasnt', 'inc', 'thereby', 'thin', 'no', 'perhaps', 'latter', 'meanwhile', 'when', 'detail', 'same', 'wherein', 'beside', 'also', 'that', 'other', 'take', 'which', 'becomes', 'you', 'if', 'nobody', 'see', 'though', 'may', 'after', 'upon', 'most', 'hereupon', 'eight', 'but', 'serious', 'nothing', 'such', 'why', 'a', 'off', 'whereby', 'third', 'i', 'whole', 'noone', 'sometimes', 'well', 'amoungst', 'yours', 'their', 'rather', 'without', 'so', 'five', 'the', 'first', 'whereas', 'once']\n"
+     ]
+    }
+   ],
    "source": [
     "stop_words = ['all', 'six', 'less', 'being', 'indeed', 'over', 'move', 'anyway', 'fifty', 'four', 'not', 'own', 'through', 'yourselves', 'go', 'where', 'mill', 'only', 'find', 'before', 'one', 'whose', 'system', 'how', 'somewhere', 'with', 'thick', 'show', 'had', 'enough', 'should', 'to', 'must', 'whom', 'seeming', 'under', 'ours', 'has', 'might', 'thereafter', 'latterly', 'do', 'them', 'his', 'around', 'than', 'get', 'very', 'de', 'none', 'cannot', 'every', 'whether', 'they', 'front', 'during', 'thus', 'now', 'him', 'nor', 'name', 'several', 'hereafter', 'always', 'who', 'cry', 'whither', 'this', 'someone', 'either', 'each', 'become', 'thereupon', 'sometime', 'side', 'two', 'therein', 'twelve', 'because', 'often', 'ten', 'our', 'eg', 'some', 'back', 'up', 'namely', 'towards', 'are', 'further', 'beyond', 'ourselves', 'yet', 'out', 'even', 'will', 'what', 'still', 'for', 'bottom', 'mine', 'since', 'please', 'forty', 'per', 'its', 'everything', 'behind', 'un', 'above', 'between', 'it', 'neither', 'seemed', 'ever', 'across', 'she', 'somehow', 'be', 'we', 'full', 'never', 'sixty', 'however', 'here', 'otherwise', 'were', 'whereupon', 'nowhere', 'although', 'found', 'alone', 're', 'along', 'fifteen', 'by', 'both', 'about', 'last', 'would', 'anything', 'via', 'many', 'could', 'thence', 'put', 'against', 'keep', 'etc', 'amount', 'became', 'ltd', 'hence', 'onto', 'or', 'con', 'among', 'already', 'co', 'afterwards', 'formerly', 'within', 'seems', 'into', 'others', 'while', 'whatever', 'except', 'down', 'hers', 'everyone', 'done', 'least', 'another', 'whoever', 'moreover', 'couldnt', 'throughout', 'anyhow', 'yourself', 'three', 'from', 'her', 'few', 'together', 'top', 'there', 'due', 'been', 'next', 'anyone', 'eleven', 'much', 'call', 'therefore', 'interest', 'then', 'thru', 'themselves', 'hundred', 'was', 'sincere', 'empty', 'more', 'himself', 'elsewhere', 'mostly', 'on', 'fire', 'am', 'becoming', 'hereby', 'amongst', 'else', 'part', 'everywhere', 'too', 'herself', 'former', 'those', 'he', 'me', 'myself', 'made', 'twenty', 'these', 'bill', 'cant', 'us', 'until', 'besides', 'nevertheless', 'below', 'anywhere', 'nine', 'can', 'of', 'your', 'toward', 'my', 'something', 'and', 'whereafter', 'whenever', 'give', 'almost', 'wherever', 'is', 'describe', 'beforehand', 'herein', 'an', 'as', 'itself', 'at', 'have', 'in', 'seem', 'whence', 'ie', 'any', 'fill', 'again', 'hasnt', 'inc', 'thereby', 'thin', 'no', 'perhaps', 'latter', 'meanwhile', 'when', 'detail', 'same', 'wherein', 'beside', 'also', 'that', 'other', 'take', 'which', 'becomes', 'you', 'if', 'nobody', 'see', 'though', 'may', 'after', 'upon', 'most', 'hereupon', 'eight', 'but', 'serious', 'nothing', 'such', 'why', 'a', 'off', 'whereby', 'third', 'i', 'whole', 'noone', 'sometimes', 'well', 'amoungst', 'yours', 'their', 'rather', 'without', 'so', 'five', 'the', 'first', 'whereas', 'once']\n",
-    "\n",
+    "print(stop_words)\n",
     "# Write your code below\n"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['ironhack', 'cool', 'love', 'student']"
+      ]
+     },
+     "execution_count": 12,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "bag_of_words = [word for word in bag_of_words if word not in stop_words]\n",
+    "bag_of_words"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 13,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[1, 1, 0, 0]\n",
+      "[1, 0, 1, 0]\n",
+      "[1, 0, 0, 1]\n",
+      "[[1, 1, 0, 0], [1, 0, 1, 0], [1, 0, 0, 1]]\n"
+     ]
+    }
+   ],
+   "source": [
+    "term_freq = []\n",
+    "for i in range(len(corpus)):\n",
+    "    temp_list =[]\n",
+    "    for word in bag_of_words:\n",
+    "        conteo = corpus[i].split().count(word)\n",
+    "        temp_list.append(conteo)\n",
+    "    print(temp_list)\n",
+    "    term_freq.append(temp_list)\n",
+    "print(term_freq)"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -460,6 +465,83 @@
     " [1 1 0 1 0 0 1]]\n",
     " ```"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 14,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['ironhack is cool', 'i love ironhack', 'i am a student at ironhack']\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(corpus)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 15,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from sklearn.feature_extraction.text import CountVectorizer"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 16,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[[0 0 1 1 1 0 0]\n",
+      " [0 0 0 1 0 1 0]\n",
+      " [1 1 0 1 0 0 1]]\n",
+      "{'ironhack': 3, 'is': 4, 'cool': 2, 'love': 5, 'am': 0, 'student': 6, 'at': 1}\n"
+     ]
+    }
+   ],
+   "source": [
+    "vector = CountVectorizer()\n",
+    "print(vector.fit_transform(corpus).todense())\n",
+    "print(vector.vocabulary_)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 17,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[[1 1 0 0]\n",
+      " [0 1 1 0]\n",
+      " [0 1 0 1]]\n",
+      "{'ironhack': 1, 'cool': 0, 'love': 2, 'student': 3}\n"
+     ]
+    }
+   ],
+   "source": [
+    "vector = CountVectorizer(stop_words = \"english\")\n",
+    "print(vector.fit_transform(corpus).todense())\n",
+    "print(vector.vocabulary_)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {