python图书管理系统

class Book(object):
    def __init__(self,name,author,atate=1):
        self.name = name
        self.author = author
        self.state =atate
    def __str__(self):
        return "书名:{} 作者:{} 状态：{}".format(self.name,self.author,self.state)

class BookManage(object):
    books = list()

    def start(self):
        self.books.append(Book("java","山客",