python_案例综合：教材记录管理

 class Book():
     def __init__(self,ISBN,Ftile,Author,Publisher):
         self.ISBN = ISBN
         self.Ftile = Ftile
         self.Author = Author
         self.Publisher = Publisher

     def show(self):
         print(self.ISBN,self.Ftile,self.Author,self.Publisher)

 class BookList():
     def __init__(self):
         self.books = []

     def show(self):
         print(self.ISBN, self.Ftile, self.Author, self.Publisher)
         for i in self.books:
             self.show()

     def __insert(self,s):
         i = 0
         while(i<len(self.books) and s.ISBN > self.books[i]):
             i=i+1
         self.books.insert(i,s)#指定位置添加一个元素
         print("ok")

     def __update(self,s):
         i = 0
         while(i<len(self.books) and s.ISBN != self.books[i]):
             i=i+1
         if(s.ISBN==self.books[i]):
             del self.books[i]
             self.books.insert(i,s)
             print("-- update @ ok --")
         else:
             print("--error--")

     def __delete(self):
         while(i<len(self.books) and s.ISBN != self.books[1]):
             i=i+1
         if(s.ISBN ==self.books[i]):
             del self.books[i]
             print("-- delete @ ok --")
         else:
             print("--error--")

     def insert(self):
         ISBN = input('ISBN:')
         Ftile = input('Ftile:')
         Author = input('Author:')
         Publisher = input('Publisher:')
         if (ISBN!='' and Ftile!=''):
               self.__insert(Book(ISBN,Ftile,Author,Publisher))
         else:
             print("--ISBN/Ftile^error--")

     def update(self):
         ISBN = input('ISBN:')
         Ftile = input('Ftile:')
         Author = input('Author:')
         Publisher = input('Publisher:')
         if (ISBN != '' or Ftile != '' or Author!='' or Publisher!=''):
             self.__update(Book(ISBN, Ftile, Author, Publisher))
         else:
             print("---error---")

     def delete(self):
         ISBN = input('ISBN:')
         Ftile = input('Ftile:')
         Author = input('Author:')
         Publisher = input('Publisher:')
         if (ISBN != '' or Ftile != '' or Author != '' or Publisher != ''):
             self.__delete(Book(ISBN, Ftile, Author, Publisher))
         else:
             print("---error---")

     def scan(self):
         while True:
             s = input(">>>")
             if s=='show':
                 self.show()
             elif s=='insert':
                 self.insert()
             elif s=='update':
                 self.update()
             elif s=='delete':
                 self.delete()
             elif s=='exit':
                 break
             else:
                 print(" ---- Error ---- ")
                 return 0
         self.File()
         #print(self.books)   》》》》[<__main__.Book object at 0x0000020B3A08CFD0>]

     def File(self):
         f = open('jiaocai.txt','wt+',encoding = 'utf-8')
         for i in self.books:
             f.write(i.ISBN+'\n')
             f.write(i.Ftile+'\n')
             f.write(i.Author+'\n')
             f.write(i.Publisher+'\n')
         #books = self.books
         #f.write(str(books))#不可用
         f.close()

 Bl=BookList()
 Bl.scan()
 #print(BookList.books)