From 77a78b84f14199663242a1818c4dd918d4c47b78 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kerem=20=C3=87a=C4=9Fan=20=C3=9Clver?=
 <kerulver@hotmail.com>
Date: Fri, 3 Apr 2026 09:25:12 +0300
Subject: [PATCH 1/9] Add weighted sampling function in
 weighted_keremcagan_ulver.py

---
 Week02/weighted_keremcagan_ulver.py | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 Week02/weighted_keremcagan_ulver.py

diff --git a/Week02/weighted_keremcagan_ulver.py b/Week02/weighted_keremcagan_ulver.py
new file mode 100644
index 00000000..46c26450
--- /dev/null
+++ b/Week02/weighted_keremcagan_ulver.py
@@ -0,0 +1,5 @@
+import random
+
+def weighted_srs(data, n, weights, *, with_replacement=False):
+    w = None if with_replacement else weights
+    return random.choices(data, weights=w, k=n)

From 384773262b655276b670a071c2b83cda19b7b3b8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kerem=20=C3=87a=C4=9Fan=20=C3=9Clver?=
 <kerulver@hotmail.com>
Date: Fri, 3 Apr 2026 09:30:56 +0300
Subject: [PATCH 2/9] Refactor weighted_srs function for better handling

---
 Week02/weighted_keremcagan_ulver.py | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/Week02/weighted_keremcagan_ulver.py b/Week02/weighted_keremcagan_ulver.py
index 46c26450..44cda493 100644
--- a/Week02/weighted_keremcagan_ulver.py
+++ b/Week02/weighted_keremcagan_ulver.py
@@ -1,5 +1,6 @@
 import random
 
-def weighted_srs(data, n, weights, *, with_replacement=False):
-    w = None if with_replacement else weights
-    return random.choices(data, weights=w, k=n)
+def weighted_srs(data, n, weights=None, with_replacement=False):
+    if with_replacement: return random.choices(data, k=n)
+    if weights is None: return random.sample(data, k=n)
+    return random.choices(data, weights=weights, k=n)

From ae2c4d9fe8a3dd3dc0a96ff21526036efb373feb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kerem=20=C3=87a=C4=9Fan=20=C3=9Clver?=
 <kerulver@hotmail.com>
Date: Fri, 3 Apr 2026 09:35:25 +0300
Subject: [PATCH 3/9] Refactor weighted_srs for improved sampling with weights

Refactor weighted_srs function to handle weights more effectively and remove sampling without replacement.
---
 Week02/weighted_keremcagan_ulver.py | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/Week02/weighted_keremcagan_ulver.py b/Week02/weighted_keremcagan_ulver.py
index 44cda493..977762f3 100644
--- a/Week02/weighted_keremcagan_ulver.py
+++ b/Week02/weighted_keremcagan_ulver.py
@@ -1,6 +1,9 @@
 import random
 
-def weighted_srs(data, n, weights=None, with_replacement=False):
-    if with_replacement: return random.choices(data, k=n)
-    if weights is None: return random.sample(data, k=n)
-    return random.choices(data, weights=weights, k=n)
+def weighted_srs(data, n, weights, with_replacement=False):
+    if with_replacement: return random.choices(data, weights=weights, k=n)
+    res, temp_w = [], list(weights)
+    for _ in range(n):
+        i = random.choices(range(len(data)), weights=temp_w)[0]
+        res.append(data[i]); temp_w[i] = 0
+    return res

From 36109e9961f5897ac4f7894a8c95d33e6a6614e4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kerem=20=C3=87a=C4=9Fan=20=C3=9Clver?=
 <kerulver@hotmail.com>
Date: Fri, 3 Apr 2026 09:36:59 +0300
Subject: [PATCH 4/9] Refactor weighted sampling function and add shifted
 function

Removed weighted sampling function and added shifted function to calculate the percentage difference between mean and median.
---
 Week02/weighted_keremcagan_ulver.py | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/Week02/weighted_keremcagan_ulver.py b/Week02/weighted_keremcagan_ulver.py
index 977762f3..984218a9 100644
--- a/Week02/weighted_keremcagan_ulver.py
+++ b/Week02/weighted_keremcagan_ulver.py
@@ -1,9 +1,6 @@
-import random
+import statistics
 
-def weighted_srs(data, n, weights, with_replacement=False):
-    if with_replacement: return random.choices(data, weights=weights, k=n)
-    res, temp_w = [], list(weights)
-    for _ in range(n):
-        i = random.choices(range(len(data)), weights=temp_w)[0]
-        res.append(data[i]); temp_w[i] = 0
-    return res
+def shifted(data):
+    mean = statistics.mean(data)
+    median = statistics.median(data)
+    return abs(mean - median) / abs(mean) * 100 if mean != 0 else 0

From bf8479943b93e862a837dc31515e8e888312a0ad Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kerem=20=C3=87a=C4=9Fan=20=C3=9Clver?=
 <kerulver@hotmail.com>
Date: Fri, 3 Apr 2026 09:38:16 +0300
Subject: [PATCH 5/9] Add weighted sampling function to the script

---
 Week02/weighted_keremcagan_ulver.py | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/Week02/weighted_keremcagan_ulver.py b/Week02/weighted_keremcagan_ulver.py
index 984218a9..070d9f84 100644
--- a/Week02/weighted_keremcagan_ulver.py
+++ b/Week02/weighted_keremcagan_ulver.py
@@ -1,6 +1,8 @@
 import statistics
-
-def shifted(data):
-    mean = statistics.mean(data)
-    median = statistics.median(data)
-    return abs(mean - median) / abs(mean) * 100 if mean != 0 else 0
+def weighted_srs(data, n, weights, with_replacement=False):
+    if weights is None:
+        return random.choices(data, k=n) if with_replacement else random.sample(data, n)
+    if with_replacement:
+        return random.choices(data, weights=weights, k=n)
+    population = sum([[d]*w for d, w in zip(data, weights)], [])
+    return random.sample(population, n)

From c10aec7098d1442eb6de532bdeec348f0575cb9a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kerem=20=C3=87a=C4=9Fan=20=C3=9Clver?=
 <kerulver@hotmail.com>
Date: Fri, 3 Apr 2026 09:40:11 +0300
Subject: [PATCH 6/9] Refactor weighted_srs function for sampling

Refactor weighted sampling logic for better performance.
---
 Week02/weighted_keremcagan_ulver.py | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/Week02/weighted_keremcagan_ulver.py b/Week02/weighted_keremcagan_ulver.py
index 070d9f84..977762f3 100644
--- a/Week02/weighted_keremcagan_ulver.py
+++ b/Week02/weighted_keremcagan_ulver.py
@@ -1,8 +1,9 @@
-import statistics
+import random
+
 def weighted_srs(data, n, weights, with_replacement=False):
-    if weights is None:
-        return random.choices(data, k=n) if with_replacement else random.sample(data, n)
-    if with_replacement:
-        return random.choices(data, weights=weights, k=n)
-    population = sum([[d]*w for d, w in zip(data, weights)], [])
-    return random.sample(population, n)
+    if with_replacement: return random.choices(data, weights=weights, k=n)
+    res, temp_w = [], list(weights)
+    for _ in range(n):
+        i = random.choices(range(len(data)), weights=temp_w)[0]
+        res.append(data[i]); temp_w[i] = 0
+    return res

From aea16800b7a0297bc4ef20df4776016202a07b15 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kerem=20=C3=87a=C4=9Fan=20=C3=9Clver?=
 <kerulver@hotmail.com>
Date: Fri, 3 Apr 2026 09:42:29 +0300
Subject: [PATCH 7/9] Refactor weighted_srs function for clarity

Fix handling of None weights and improve variable naming.
---
 Week02/weighted_keremcagan_ulver.py | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/Week02/weighted_keremcagan_ulver.py b/Week02/weighted_keremcagan_ulver.py
index 977762f3..76590967 100644
--- a/Week02/weighted_keremcagan_ulver.py
+++ b/Week02/weighted_keremcagan_ulver.py
@@ -1,9 +1,10 @@
 import random
 
 def weighted_srs(data, n, weights, with_replacement=False):
+    if weights is None: return random.choices(data, k=n) if with_replacement else random.sample(data, n)
     if with_replacement: return random.choices(data, weights=weights, k=n)
-    res, temp_w = [], list(weights)
+    res, w = [], list(weights)
     for _ in range(n):
-        i = random.choices(range(len(data)), weights=temp_w)[0]
-        res.append(data[i]); temp_w[i] = 0
+        i = random.choices(range(len(data)), weights=w)[0]
+        res.append(data[i]); w[i] = 0
     return res

From 5f37a852b2888c1e215961bda7682d5a719f3017 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kerem=20=C3=87a=C4=9Fan=20=C3=9Clver?=
 <kerulver@hotmail.com>
Date: Fri, 3 Apr 2026 09:44:02 +0300
Subject: [PATCH 8/9] Refactor weighted_srs function for clarity and efficiency

---
 Week02/weighted_keremcagan_ulver.py | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/Week02/weighted_keremcagan_ulver.py b/Week02/weighted_keremcagan_ulver.py
index 76590967..c3ad3d73 100644
--- a/Week02/weighted_keremcagan_ulver.py
+++ b/Week02/weighted_keremcagan_ulver.py
@@ -1,10 +1,8 @@
 import random
 
-def weighted_srs(data, n, weights, with_replacement=False):
-    if weights is None: return random.choices(data, k=n) if with_replacement else random.sample(data, n)
-    if with_replacement: return random.choices(data, weights=weights, k=n)
-    res, w = [], list(weights)
-    for _ in range(n):
-        i = random.choices(range(len(data)), weights=w)[0]
-        res.append(data[i]); w[i] = 0
-    return res
+def weighted_srs(data, n, weights, with_replacement = False):
+    if not (with_replacement or weights):
+        sample = random.sample(data, n)
+    else:
+        sample = random.choices(data, weights=weights, k=n)
+    return sample

From 577a013c9efe3378c9e7afafa50b637074bc1fb8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kerem=20=C3=87a=C4=9Fan=20=C3=9Clver?=
 <kerulver@hotmail.com>
Date: Fri, 3 Apr 2026 09:48:27 +0300
Subject: [PATCH 9/9] Add shifted function to calculate percentage difference

---
 Week03/shifter_keremcagan_ulver.py | 6 ++++++
 1 file changed, 6 insertions(+)
 create mode 100644 Week03/shifter_keremcagan_ulver.py

diff --git a/Week03/shifter_keremcagan_ulver.py b/Week03/shifter_keremcagan_ulver.py
new file mode 100644
index 00000000..984218a9
--- /dev/null
+++ b/Week03/shifter_keremcagan_ulver.py
@@ -0,0 +1,6 @@
+import statistics
+
+def shifted(data):
+    mean = statistics.mean(data)
+    median = statistics.median(data)
+    return abs(mean - median) / abs(mean) * 100 if mean != 0 else 0