From de4cdb02d30abb34b3d08f7d8bacaf29b5a392f1 Mon Sep 17 00:00:00 2001
From: chapitak <43088225+chapitak@users.noreply.github.com>
Date: Mon, 11 Feb 2019 00:44:03 +0900
Subject: [PATCH 1/2] =?UTF-8?q?=EA=B3=BC=EC=A0=9C3?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 ...54\354\227\205\353\241\234\353\223\234.py" | 171 ++++++++++++++++++
 1 file changed, 171 insertions(+)
 create mode 100644 "\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 #3 \354\236\254\354\227\205\353\241\234\353\223\234.py"

diff --git "a/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 #3 \354\236\254\354\227\205\353\241\234\353\223\234.py" "b/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 #3 \354\236\254\354\227\205\353\241\234\353\223\234.py"
new file mode 100644
index 0000000..8fdc1bb
--- /dev/null
+++ "b/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 #3 \354\236\254\354\227\205\353\241\234\353\223\234.py"	
@@ -0,0 +1,171 @@
+import datetime
+import csv
+import os
+
+class Board():
+    def __init__(self):
+        self.posts = []
+        self.actions = [self.add_post, self.update_post, self.delete_post, self.go_to_previous_page, self.go_to_next_page]
+        self.page_index = 1
+        self.posts_per_page = 15
+        
+
+    @staticmethod 
+    def print_actions(): 
+        print('---------------------------------------')
+        print('1. 작성하기')
+        print('2. 수정하기')
+        print('3. 삭제하기')
+        # print('4. 저장하기')
+        print('4. 이전 페이지로')
+        print('5. 다음 페이지로')
+        print('---------------------------------------')
+
+    def print_post_list(self):
+        if self.posts == []:
+            print("작성된 판매게시글이 없습니다.")
+            print("회원님이 한 번 작성해보시는 것이 어떨까요?")
+            return
+
+        self.posts.sort(reverse=True)
+
+        paged_posts = self.posts[self.posts_per_page*(self.page_index-1):self.posts_per_page*self.page_index]
+
+        for post in paged_posts: # [FIX] 포맷 한글일 때 padding 제대로 출력안됨. 들쑥날쑥
+            print('{:^8} | {:<60} | {}'.format(post.post_no, post.post_title, post.post_inserted_time))
+
+        page_length = self.get_page_length()
+        print('Page: {}'.format(str(self.page_index) + '/' + str(page_length)))
+
+    def get_user_action(self):
+        try:
+            user_action_no = int(input('> '))
+        except:
+            print('잘못된 입력입니다.')
+            input()    
+            return  
+        if user_action_no >0 and user_action_no <= len(self.actions):
+            self.actions[user_action_no - 1]()
+            return  
+        print('잘못된 입력입니다.')
+
+    def save_posts_decorator(func):
+        def wrapper(self):
+            func(self)
+            with open ('중고나라 데이터.csv', 'w', encoding='utf8', newline='') as save_data:
+                posts_write = csv.writer(save_data)
+                # posts_write.writerows(self.posts)
+                # [FIx] 코드가 너무 깊으면 나중에 Post를 Iterable한 클래스로 만들어서 writerows 메서드를 쓰자
+                for post in self.posts:
+                    posts_write.writerow([post.post_no, post.post_title, post.post_inserted_time])
+
+                input('저장이 완료되었습니다')
+        return wrapper
+
+    @save_posts_decorator
+    def add_post(self):
+        if self.posts == []:
+            post_no = 1
+        if self.posts != []:
+            post_no = self.posts[0].post_no + 1
+        
+        post_title = input('내용> ')
+        
+        post_inserted_time = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')
+        self.posts.append(Post(post_no, post_title, post_inserted_time))
+    
+    @save_posts_decorator
+    def update_post(self):
+        try:
+            target_post_no = int(input('몇 번 글을 수정할까요? '))
+        except:
+            input('잘못된 입력입니다')
+            return
+        
+        try:
+            target_post_index = [index for index, post in enumerate(self.posts) if post.post_no == target_post_no][0]
+        except:
+            input('잘못된 입력입니다')
+            return
+        self.posts[target_post_index].post_title = input('수정할 내용을 입력해주세요 >')
+        print(str(target_post_no) +'번 글이 수정되었습니다')
+    
+    @save_posts_decorator
+    def delete_post(self):
+        try:
+            target_post_no = int(input('몇 번 글을 삭제할까요? '))
+        except:
+            input('잘못된 입력입니다')
+            return     
+        try:
+            target_post_index = [index for index, post in enumerate(self.posts) if post.post_no == target_post_no][0]
+        except:
+            input('잘못된 입력입니다')
+            return
+        del(self.posts[target_post_index])
+        print(str(target_post_no) +'번 글이 삭제되었습니다')
+
+    # def save_posts(self):
+    #     with open ('중고나라 데이터.csv', 'w', encoding='utf8', newline='') as save_data:
+    #         posts_write = csv.writer(save_data)
+    #         posts_write.writerows(self.posts)
+    #     input('저장이 완료되었습니다')
+    
+    def load_posts(self):
+        with open ('중고나라 데이터.csv', 'r', encoding='utf8') as load_data:
+            posts_read = csv.reader(load_data)
+            posts_read = [Post(int(post[0]), post[1], post[2]) for post in posts_read]
+            self.posts = list(posts_read)
+
+    def go_to_next_page(self):
+        page_length = self.get_page_length()
+        page_index_to_go = self.page_index + 1
+        if page_index_to_go > page_length:
+            input("가장 끝 페이지입니다.")
+            return
+        self.page_index = page_index_to_go
+
+    def go_to_previous_page(self):
+        page_index_to_go = self.page_index - 1
+        if page_index_to_go < 1:
+            input("가장 앞 페이지입니다.")
+            return
+        self.page_index = page_index_to_go
+    
+    def get_page_length(self):
+        return len(self.posts)//(self.posts_per_page) + 1
+
+
+# Post Class만들기
+class Post:
+    def __init__(self, post_no, post_title, post_inserted_time):
+        self.post_no = post_no
+        self.post_title = post_title
+        self.post_inserted_time = post_inserted_time
+
+    def __lt__(self, other): # 별도 모듈 없이 클래스 정렬을 위함
+        return self.post_no < other.post_no
+
+
+
+
+
+    
+def clear_screen():
+    os.system('cls' if os.name == 'nt' else 'clear')
+
+if __name__ == "__main__":
+    print("본 프로그램은 광일공방에서 중고거래 사이트를 기웃거리던 광일이가 \n...\n중략\n...\n아나바다 철학이 담긴 프로그램을 밤을 지새우며 코드를 작성합니다.")
+    input("프로그램을 시작하시려면 엔터키를 입력하세요...")
+    board = Board()
+    try:
+        board.load_posts()
+    except:
+        input("파일을 불러오지 못했습니다.")
+
+    while True:
+        clear_screen()
+        board.print_post_list()
+        board.print_actions()
+        board.get_user_action()
+                
\ No newline at end of file

From ad3da48127b972f5374b31b12038985d2f98ae33 Mon Sep 17 00:00:00 2001
From: chapitak <43088225+chapitak@users.noreply.github.com>
Date: Wed, 20 Feb 2019 19:21:47 +0900
Subject: [PATCH 2/2] =?UTF-8?q?=EA=B4=91=EC=9D=BC=EA=B3=B5=EB=B0=A9=20?=
 =?UTF-8?q?=EC=A4=91=EA=B3=A0=EB=82=98=EB=9D=BC=20=EA=B3=BC=EC=A0=9C4?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../__init__.py"                              |  33 +++++
 .../__pycache__/board.cpython-37.pyc"         | Bin 0 -> 5402 bytes
 .../__pycache__/post.cpython-37.pyc"          | Bin 0 -> 1798 bytes
 .../__pycache__/user.cpython-37.pyc"          | Bin 0 -> 865 bytes
 .../user_management.cpython-37.pyc"           | Bin 0 -> 2840 bytes
 .../board.py"                                 | 138 ++++++++++++++++++
 .../post.py"                                  |  47 ++++++
 .../second-hand_shop_post_data.csv"           |  13 ++
 .../second-hand_shop_user_data.csv"           |   1 +
 .../user.py"                                  |  15 ++
 .../user_management.py"                       |  67 +++++++++
 11 files changed, 314 insertions(+)
 create mode 100644 "\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/__init__.py"
 create mode 100644 "\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/__pycache__/board.cpython-37.pyc"
 create mode 100644 "\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/__pycache__/post.cpython-37.pyc"
 create mode 100644 "\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/__pycache__/user.cpython-37.pyc"
 create mode 100644 "\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/__pycache__/user_management.cpython-37.pyc"
 create mode 100644 "\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/board.py"
 create mode 100644 "\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/post.py"
 create mode 100644 "\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/second-hand_shop_post_data.csv"
 create mode 100644 "\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/second-hand_shop_user_data.csv"
 create mode 100644 "\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/user.py"
 create mode 100644 "\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/user_management.py"

diff --git "a/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/__init__.py" "b/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/__init__.py"
new file mode 100644
index 0000000..4f23ca5
--- /dev/null
+++ "b/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/__init__.py"	
@@ -0,0 +1,33 @@
+import os
+from board import Board  
+from post import Post
+from user_management import User_management
+
+def clear_screen():
+    os.system('cls' if os.name == 'nt' else 'clear')
+
+if __name__ == "__main__":
+    print("본 프로그램은 광일공방에서 중고거래 사이트를 기웃거리던 광일이가 \n...\n중략\n...\n아나바다 철학이 담긴 프로그램을 밤을 지새우며 코드를 작성합니다.")
+    input("프로그램을 시작하시려면 로그인하세요")
+    user_management = User_management()
+    try:
+        user_management.load_users()
+    except:
+        pass
+    signed_in_user_id = None    
+    while signed_in_user_id == None:
+        user_management.print_actions()
+        signed_in_user_id = user_management.get_user_action()
+
+    
+    board = Board(signed_in_user_id)
+    try:
+        board.load_posts()
+    except:
+        input("파일을 불러오지 못했습니다.")
+
+    while True:
+        clear_screen()
+        board.print_post_list()
+        board.print_actions()
+        board.get_user_action()
\ No newline at end of file
diff --git "a/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/__pycache__/board.cpython-37.pyc" "b/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/__pycache__/board.cpython-37.pyc"
new file mode 100644
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diff --git "a/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/__pycache__/post.cpython-37.pyc" "b/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/__pycache__/post.cpython-37.pyc"
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diff --git "a/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/board.py" "b/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/board.py"
new file mode 100644
index 0000000..58d2967
--- /dev/null
+++ "b/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/board.py"	
@@ -0,0 +1,138 @@
+import datetime
+import csv
+from post import Post
+
+POST_DATA_PATH = 'second-hand_shop_post_data.csv'
+
+class Board():
+    def __init__(self, signed_in_user_id):
+        self.signed_in_user_id = signed_in_user_id
+        self.posts = []
+        self.actions = [self.add_post, self.update_post, self.delete_post, self.go_to_previous_page, self.go_to_next_page]
+        self.page_index = 1
+        self.posts_per_page = 15
+        
+
+    @staticmethod 
+    def print_actions(): 
+        print('---------------------------------------')
+        print('1. 작성하기')
+        print('2. 수정하기')
+        print('3. 삭제하기')
+        # print('4. 저장하기')
+        print('4. 이전 페이지로')
+        print('5. 다음 페이지로')
+        print('---------------------------------------')
+
+    def print_post_list(self):
+        if self.posts == []:
+            print("작성된 판매게시글이 없습니다.")
+            print("회원님이 한 번 작성해보시는 것이 어떨까요?")
+            return
+
+        not_deleted_posts = (post for post in self.posts if post.post_deleted == 'N')
+        self.posts = list(not_deleted_posts)
+        self.posts.sort(reverse=True)
+        paged_posts = self.posts[self.posts_per_page*(self.page_index-1):self.posts_per_page*self.page_index]
+        for post in paged_posts: # [FIX] 포맷 한글일 때 padding 제대로 출력안됨. 들쑥날쑥
+            print('{:^8} | {:<60} | {:^6} | {}'.format(post.post_no, post.post_title, post.post_register, post.post_inserted_time))
+
+        page_length = self.get_page_length()
+        print('Page: {}'.format(str(self.page_index) + '/' + str(page_length)))
+
+    def get_user_action(self):
+        try:
+            user_action_no = int(input('> '))
+        except:
+            print('잘못된 입력입니다.')
+            input()    
+            return  
+        if user_action_no >0 and user_action_no <= len(self.actions):
+            self.actions[user_action_no - 1]()
+            return  
+        print('잘못된 입력입니다.')
+
+    def save_posts(func):
+        def wrapper(self):
+            func(self)
+            save_data = open ('중고나라 데이터.csv', 'w', encoding='utf8', newline='')
+            posts_write = csv.writer(save_data)
+            for post in self.posts:
+                posts_write.writerow(post.save_to_file())
+            save_data.close()
+            #input('저장이 완료되었습니다')
+        return wrapper
+
+    @save_posts
+    def add_post(self):
+        # if self.posts == []:
+        #     post_no = 1
+        # if self.posts != []:
+        #     post_no = self.posts[0].post_no + 1
+        post_title = input('내용> ')
+        #post_inserted_time = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')
+        self.posts.append(Post(post_title, self.signed_in_user_id))
+    
+    @save_posts
+    def update_post(self):
+        targets = self.get_target_post_no('삭제')
+        if targets == None: # 입력값 검증 에러 처리 
+            return
+        target_post_no, target_post_index = targets
+        if self.posts[target_post_index].check_authority(self.signed_in_user_id) == False:
+            input('{} 님은 해당 글에 대한 권한이 없습니다'.format(self.signed_in_user_id))
+            return
+        updated_post_title = input('수정할 내용을 입력해주세요 >')
+        self.posts[target_post_index].update_post_title(updated_post_title) 
+        print(str(target_post_no) +'번 글이 수정되었습니다')
+    
+    @save_posts
+    def delete_post(self):
+        targets = self.get_target_post_no('삭제')
+        if targets == None: # 입력값 검증 에러 처리 
+            return
+        target_post_no, target_post_index = targets
+        if self.posts[target_post_index].check_authority(self.signed_in_user_id) == False:
+            input('{} 님은 해당 글에 대한 권한이 없습니다'.format(self.signed_in_user_id))
+            return
+        self.posts[target_post_index].logical_delete()    
+        # del(self.posts[target_post_index])
+        print(str(target_post_no) +'번 글이 삭제되었습니다')
+    
+    def get_target_post_no(self, action):
+        try:
+            target_post_no = int(input('몇 번 글을 {}할까요? '.format(action)))
+        except:
+            input('잘못된 입력입니다')
+            return     
+        try:
+            target_post_index = [index for index, post in enumerate(self.posts) if post.post_no == target_post_no][0] #?
+            return [target_post_no,target_post_index]
+        except:
+            input('잘못된 입력입니다')
+            return
+    
+    def load_posts(self):
+        with open (POST_DATA_PATH, 'r', encoding='utf8') as load_data:
+            posts_read = csv.reader(load_data)
+            #print(posts_read)
+            posts_read = [Post.load_from_file(*post) for post in posts_read]
+            self.posts = list(posts_read)
+
+    def go_to_next_page(self):
+        page_length = self.get_page_length()
+        page_index_to_go = self.page_index + 1
+        if page_index_to_go > page_length:
+            input("가장 끝 페이지입니다.")
+            return
+        self.page_index = page_index_to_go
+
+    def go_to_previous_page(self):
+        page_index_to_go = self.page_index - 1
+        if page_index_to_go < 1:
+            input("가장 앞 페이지입니다.")
+            return
+        self.page_index = page_index_to_go
+    
+    def get_page_length(self):
+        return len(self.posts)//(self.posts_per_page) + 1
\ No newline at end of file
diff --git "a/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/post.py" "b/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/post.py"
new file mode 100644
index 0000000..7e07bb3
--- /dev/null
+++ "b/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/post.py"	
@@ -0,0 +1,47 @@
+import datetime
+
+# Post Class만들기
+class Post:
+    max_post_no = 0
+
+    def __init__(self, post_title, post_register, post_no=None, post_deleted=None ,post_inserted_time=None):
+        self.post_title = post_title
+        self.post_register = post_register
+        print(Post.max_post_no)
+        if post_no != None and int(post_no) > Post.max_post_no:
+            Post.max_post_no = int(post_no)
+        if post_no == None:
+            post_no = Post.max_post_no + 1
+            Post.max_post_no = post_no
+        self.post_no = int(post_no)
+        # self.post_no = post_no if post_deleted is not None else 
+        if post_deleted is None:
+            post_deleted = 'N'
+        self.post_deleted = post_deleted
+        if post_inserted_time is None:
+            post_inserted_time = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')
+        self.post_inserted_time = post_inserted_time
+
+    def __lt__(self, other): # 별도 모듈 없이 클래스 정렬을 위함
+        return self.post_no < other.post_no
+
+    def save_to_file(self):
+        return [self.post_title, self.post_register, self.post_no, self.post_deleted, self.post_inserted_time]
+
+    @staticmethod
+    def load_from_file(file_post_title, file_post_register, file_post_no, file_post_deleted, file_post_inserted_time):
+        new_post = Post(file_post_title, file_post_register, file_post_no, file_post_deleted, file_post_inserted_time)
+        return new_post
+
+    def logical_delete(self):
+        self.post_deleted = 'Y'
+
+    def update_post_title(self, updated_post_title):
+        self.post_title = updated_post_title
+
+    def check_authority(self, signed_in_user_id):
+        if self.post_register == signed_in_user_id:
+            return True
+        if self.post_register != signed_in_user_id:
+            return False
+    
\ No newline at end of file
diff --git "a/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/second-hand_shop_post_data.csv" "b/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/second-hand_shop_post_data.csv"
new file mode 100644
index 0000000..69a4592
--- /dev/null
+++ "b/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/second-hand_shop_post_data.csv"	
@@ -0,0 +1,13 @@
+kkf,14ce0690bcd37cfa99453ad28008e4b1e006c8ca97836e4f6609076b465fa8fc
+ㄹㄹ,0fc61591190925209ee237e0540dee16366a05cee4ffb624daabd4e97b03294e
+gg,cbd3cfb9b9f51bbbfbf08759e243f5b3519cbf6ecc219ee95fe7c667e32c0a8d
+r,454349e422f05297191ead13e21d3db520e5abef52055e4964b82fb213f593a1
+gg,cbd3cfb9b9f51bbbfbf08759e243f5b3519cbf6ecc219ee95fe7c667e32c0a8d
+a ef,be09701de4d930456b51bcf1b81aefd0510b36d3621847a8ddca9aad487291df
+1,6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b
+1,6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b
+chapita,7a7356d071ed42e3a2298ce63ffee982f7a4e76964a26855cdf5a4585b6406e1
+ㄷ ㅎ,e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
+,e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
+1,6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b
+1,6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b
diff --git "a/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/second-hand_shop_user_data.csv" "b/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/second-hand_shop_user_data.csv"
new file mode 100644
index 0000000..3df82b8
--- /dev/null
+++ "b/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/second-hand_shop_user_data.csv"	
@@ -0,0 +1 @@
+1,6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b
diff --git "a/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/user.py" "b/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/user.py"
new file mode 100644
index 0000000..6b31e01
--- /dev/null
+++ "b/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/user.py"	
@@ -0,0 +1,15 @@
+import hashlib
+
+class User:
+    def __init__(self, user_id, user_password):
+        self.user_id = user_id
+        encoded_password = user_password.encode()
+        self.user_password = hashlib.sha256(encoded_password).hexdigest()
+
+    def save_to_file(self):
+        return [self.user_id, self.user_password]    
+
+    @staticmethod
+    def load_from_file(file_user_id, file_user_password):
+        new_user = User(file_user_id, file_user_password)
+        return new_user
\ No newline at end of file
diff --git "a/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/user_management.py" "b/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/user_management.py"
new file mode 100644
index 0000000..93e8712
--- /dev/null
+++ "b/\352\264\221\354\235\274\352\263\265\353\260\251 \354\244\221\352\263\240\353\202\230\353\235\274 \352\263\274\354\240\234#4/user_management.py"	
@@ -0,0 +1,67 @@
+import csv
+from user import User 
+
+
+USER_DATA_PATH = 'second-hand_shop_user_data.csv'
+
+class User_management:
+    def __init__(self):
+        self.actions = [self.sign_up, self.sign_in]
+        self.users = []
+
+    @staticmethod 
+    def print_actions(): 
+        print('---------------------------------------')
+        print('1. 회원가입')
+        print('2. 로그인')
+        print('---------------------------------------')
+    
+    def get_user_action(self):
+        try:
+            user_action_no = int(input('> '))
+        except:
+            print('잘못된 입력입니다.')
+            input()    
+            return  
+        if user_action_no >0 and user_action_no <= len(self.actions):
+            signed_in_user_id = self.actions[user_action_no - 1]()
+            return signed_in_user_id
+        print('잘못된 입력입니다.')
+
+    def load_users(self):
+        with open (USER_DATA_PATH, 'r', encoding='utf8') as load_data:
+            users_read = csv.reader(load_data)
+            #print(posts_read)
+            users_read = [User.load_from_file(*user) for user in users_read]
+            self.users = list(users_read)
+
+    def sign_up(self):
+        user_id = input('아이디: ')
+        user_password = input('비밀번호: ')
+        new_user = User(user_id, user_password)
+        self.users.append(new_user)
+
+        save_data = open (USER_DATA_PATH, 'w', encoding='utf8', newline='')
+        users_write = csv.writer(save_data)
+        for user in self.users:
+            users_write.writerow(user.save_to_file())
+        save_data.close()
+        
+        self.sign_in_success(user_id)
+        return user_id
+        
+    def sign_in(self):
+        input_user_id = input('아이디: ')
+        input_user_password = input('비밀번호: ')
+
+        checked_user = list(user for user in self.users if user.user_id == input_user_id and user.user_password == input_user_password)
+        if checked_user != []:
+            self.sign_in_success(input_user_id)   
+            return input_user_id
+        if checked_user == []:
+            input('로그인에 실패하였습니다')
+        
+    def sign_in_success(self, user_id):
+        input('로그인 성공: 환영합니다, {} 님!'.format(user_id))
+
+        
\ No newline at end of file