Python简易版图书管理系统

"""图书管理系统"""import random# books={书名:剩余数量, 书名:剩余数量}import timebooks = {"防脱发指南": 5, "颈椎康复指南": 3, "从删库到跑路": 0}# students_books=[name,{书}]students_books = {"赵路遥": []}class book(object): """先传一个书名,以后可根据需要传 开始借书时间,书的详细信息,以及之前借书的人等等""" def __init__(self, bookname): super(book, self).__init__() self.bookname = bookname def getBookName(self): return self.booknameif __name__ == "__main__": print("*" * 50) print("欢迎来到遥遥哥的图书馆".center(50)) print("*" * 50) while True: choices = input("""  请选择你所需要的功能1.查询书籍 2.借书 3.还书 4.显示所有书籍 5.查询用户所借的书 6.退出系统:""") if choices == '1':  # 查询书籍  print('--------查询书籍---------')  search_book = input('请输入要查询的书籍名称:')  # 遍历books  for book in books.keys():  if search_book in book:   print("正在查找,请稍等")   time.sleep(1)   if books[search_book] > 0:   print("你说查找的书,目前还有{}本".format(books[search_book]))   break   else:   print("你所查找的书,已经借完,请过段时间之后再来")   break  else:  print("对不起你所输入的书不存在,可联系管理员补充") elif choices == '2':  # 借书  print("欢迎来到借书页面".center(50))  flag = True  while flag:  user_name = input("请输入用户名")  borrow_book = input("请输入你所借的书名")  for book in books.keys():   if borrow_book == book:   if user_name in students_books.keys():    if books[borrow_book] > 0:    if borrow_book not in students_books[user_name]:     print(r"你已经借书<<{}>>".format(borrow_book))     students_books[user_name].append(borrow_book)     books[borrow_book] -= 1     print(r"现在<<{}>>,剩余{}本".format(borrow_book, books[borrow_book]))     flag = False     break    else:     print("对不起,你已经借了一本")     flag = False     break    else:    print("对不起你所借的书剩余{}本,请下次再来".format(books[borrow_book]))    flag = False    break   else:    students_books[user_name] = []    students_books[user_name].append(borrow_book)    books[borrow_book] -= 1    print(r"新用户( {} )已经借书<< {} >>,目前此书剩余{}本".format(user_name, borrow_book, books[borrow_book]))    flag = False    break  else:   print("对不起你所查找的书,不存在,请联系管理员更新") elif choices == '3':  flag=True  while flag:  user_name = input("请输入你的名字")  repay_book = input("情输入你所要还的书")  for name in students_books.keys():   #先去判断有没有这个人   if name==user_name:   #判断有没有这本书在不在该用户   if repay_book in students_books[name]:    #判断此本书书否在图书馆库里面    if repay_book in books.keys():    books[repay_book]+=1    students_books[name].remove(repay_book)    print("正在还书,请稍等")    time.sleep(1)    print("你已经还书了,这本书数量为{}".format(books[repay_book]))    flag=False    break    else:    print("此本书不在图书馆库里面,请重新输入")    break   else:    print("你所输入的书,并在你的借书目录里面,请重新输入")    break  else:   print("对不起你所输入的人不存在,请重新输入") elif choices == '4':  # 显示所有书籍  print("图书馆目前所藏书籍如下:")  for bookkey, bookvalue in list(books.items()):  print(r"<<{}>>目前还有 {} 本".format(bookkey, bookvalue))  time.sleep(0.5) elif choices=='5':  username=input(" 请输入你要查询的用户名")  for stu in students_books.keys():  if username== stu:   print("{}所借的书有{}".format(user_name,students_books[username]))  else:  print("你查找的用户不在") elif choices == '6':  choice = ("确定是否退出,确认请输入yes,否则请输入no")  if choice == 'yes':  print("感谢你的使用,再见")  break else:  print('输入错误请重新输入....')