题目

功能描述：
图书管理系统项目功能描述：
（1）创建txt文本文档，包含如下：
① books.txt：保存有一些书籍名称；
② users.txt：用于保存用户相关的信息；
③ users_book.txt：记录哪些用户借了哪些书
（2）程序包含用户注册、用户登录、查看图书、借阅图书等相关图书管理系统的功能。
（3）可根据自己对图书管理系统的理解增加其它功能。

将问题分析划分为如下内容完成：
（1）分别编写用户注册（register）模块、用户登录（login）模块、查看图书（show_books）模块、借阅图书（borrow_book）模块，并将成功注册的用户名和密码保存在文件users.txt中，已有书籍名称保存在books.txt中，哪些用户借阅了哪些图书保存在users_book.txt中；
（2）主函数中可实现根据提示依次调用用户注册、用户登录、查看图书、借阅图书等功能。

代码

# author:dq
# project:PythonProject
# date:2021年11月04日
# function:# ① books.txt：保存有一些书籍名称；
# ② users.txt：用于保存用户相关的信息；
# ③ users_book.txt：记录哪些用户借了哪些书import os
# 创建txt文件
def create(path):file = open(path, 'a')file.close()booksPath = "./book.txt"
usersPath = "./users.txt"
usersBookPath = "./users_book.txt"# create(booksPath)
# create(usersPath)
# create(usersBookPath)# 计算已有多少数量
def count(path):read = open(path, 'r', encoding='utf-8')count = len(read.readlines())read.close()return count# 用户注册（register）模块、
def register(name, password):id = count(usersPath)users = open(usersPath, 'r', encoding='utf-8')isExist = Falsewhile True:info = users.readline()if info:if (name in info):isExist = Truebreakelse:breakusers.close()if isExist == True:print('此账号已注册，可直接进行登录！')elif isExist == False:wUser = open(usersPath, 'a', encoding='utf-8')i = str(id + 1) + '\t' + name + '\t' + password + '\n'wUser.writelines(i)print(name + '已成功注册！')wUser.close()# 用户登录（login）模块
def login(name, password):readUsers = open(usersPath, 'r', encoding='utf-8')condition = 0while True:info = readUsers.readline()if info:if ((name in info) and (password in info)):condition = 1breakelif ((name in info) or (password in info)):condition = 2breakelse:condition = 3else:breakif condition == 1:print(name + '登录成功！')return Trueelif condition == 2:print('用户名或密码错误！')return Falseelif condition == 3:print('您还未注册！')return False# 创建图书模块
def create_books(name):id = count(booksPath)book = open(booksPath, 'r', encoding='utf-8')isExist = Falsewhile True:info = book.readline()if info:if (name in info):isExist = Truebreakelse:breakbook.close()if isExist == True:print('此书籍在图书馆里已存在！')elif isExist == False:wBooK = open(booksPath, 'a', encoding='utf-8')i = str(id + 1) + '\t' + name + '\n'wBooK.writelines(i)print(name + '成功放入图书馆！')wBooK.close()# 查看图书（show_books）模块
def show_books():read = open(booksPath, 'r', encoding='utf-8')print('图书馆现有的图书如下：')while True:info = read.readline()if info:print(info)else:break# 借阅图书（borrow_book）模块，
def borrow_book(username, bookname):readUsersBook = open(usersBookPath, 'r', encoding='utf-8')readBooks = open(booksPath, 'r', encoding='utf-8')id = count(usersBookPath)condition = Falsewhile True:book = readBooks.readline()userbook = readUsersBook.readline()if book or userbook:if ((bookname in book) and (bookname in userbook)):condition = Truebreakelse:breakreadUsersBook.close()readBooks.close()if condition == True:print(bookname + '已经被借出了！')elif condition == False:wUserBook = open(usersBookPath, 'a', encoding='utf-8')i = str(id + 1) + '\t' + username + '\t' + bookname + '\n'wUserBook.writelines(i)wUserBook.close()print(username + '已成功借到' + bookname)# 程序包含用户注册、用户登录、查看图书、借阅图书等相关图书管理系统的功能。
def main():print('欢迎使用图书馆！')print('请选择要使用的功能（1-5）：')print('1.用户注册')print('2.用户登录')print('3.查看图书')print('4.捐赠图书')print('5.借阅图书')print('6.退出')while True:num = input('功能选择：')if (num == '1'):name = input('请输入要注册的用户名')password = input('请输入要注册的密码')register(name, password)elif (num == '2'):name = input('请输入用户名')password = input('请输入密码')condition = login(name, password)elif (num == '3'):show_books()elif (num == '4'):name = input('请输入要捐赠的图书')create_books(name)elif (num == '5'):name = input('请输入用户名')bookname = input('请输入要借阅的图书')borrow_book(name, bookname)elif (num == '6'):print('已成功退出！')breakelse:print('输入非法,请重新输入！')main()