python面向對象法實現圖書管理系統

class Book(object):

 def __init__(self, name, author, status, bookindex):
  self.name = name
  self.author = author
  self.status = status
  self.bookindex = bookindex

 def __str__(self):
  if self.status == 1:
   stats = '未借出'
  elif self.status == 0:
   stats = '已借出'
  else:
   stats = '狀態異常'
  return '書名: 《%s》 作者: %s 狀態: <%s> 位置: %s' \
    % (self.name, self.author, stats, self.bookindex)


class BookManage(object):
 books = []

 def start(self):
  self.books.append(Book('python', 'guido', 1, 'ISO9001'))
  self.books.append(Book('c', '譚浩強', 1, 'NFS8102'))
  self.books.append(Book('java', 'westos', 1, 'PKA7844'))
  # 0:借出 1：存在
  # python 1
  # c 1
  # java 1

 def Menu(self):
  self.start()
  while True:
   print("""
      圖書管理系統
  1.查詢圖書
  2.增加圖書
  3.借閱圖書
  4.歸還圖書
  5.退出系統
  """)

   choice = input('請選擇：')

   if choice == '1':
    self.showAllBook()
   elif choice == '2':
    self.addBook()
   elif choice == '3':
    self.borrowBook()
   elif choice == '4':
    self.returnBook()
   elif choice == '5':
    print('歡迎下次使用...')
    exit()
   else:
    print('請輸入正確選擇')
    continue

 def showAllBook(self):
  for book in self.books:
   print(book)

 def addBook(self):
  name = input('圖書名稱:')
  self.books.append(Book(name, input('作者:'), 1, input('存儲位置:')))
  print('圖書《%s》增加成功' % name)

 def checkBook(self, name):
  for book in self.books:
   if book.name == name:
    return book
  else:
   return None

 def borrowBook(self):
  name = input('借閱圖書名稱: ')
  ret = self.checkBook(name)
  print(ret)

  if ret != None:
   if ret.status == 0:
    print('書籍《%s》已經借出' % name)
   else:
    ret.status = 0
    print('書籍《%s》借閱成功' % name)
  else:
   print('書籍《%s》不存在' % name)

 def returnBook(self):
  name = input('歸還圖書名稱:')
  ret = self.checkBook(name)

  if ret != None:
   if ret.status == 0:
    ret.status = 1
    print('書籍《%s》歸還成功' % name)
    print(ret)
   else:
    print('書籍《%s》未借出' % name)
  else:
   print('書籍《%s》不存在' % name)


manager = BookManage()
manager.Menu()