python图书管理系统

图书管理系统是一个常见的管理系统，用于管理图书的借阅、归还、添加、删除等操作。下面是一个基于 Python 的图书管理系统的示例代码：

class Book:
    def __init__(self, title, author, isbn):
        self.title = title
        self.author = author
        self.isbn = isbn

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

    def add_book(self, book):
        self.books.append(book)

    def remove_book(self, book):
        self.books.remove(book)

    def find_book(self, title):
        for book in self.books:
            if book.title == title:
                return book
        return None

    def display_books(self):
        for book in self.books:
            print("Title:", book.title)
            print("Author:", book.author)
            print("ISBN:", book.isbn)

library = Library()

while True:
    print("\nMenu:")
    print("1. Add book")
    print("2. Remove book")
    print("3. Find book")
    print("4. Display all books")
    print("5. Exit")

    choice = input("Enter your choice: ")

    if choice == "1":
        title = input("Enter title: ")
        author = input("Enter author: ")
        isbn = input("Enter ISBN: ")
        book = Book(title, author, isbn)
        library.add_book(book)
        print("Book added successfully!")

    elif choice == "2":
        title = input("Enter title: ")
        book = library.find_book(title)
        if book:
            library.remove_book(book)
            print("Book removed successfully!")
        else:
            print("Book not found.")

    elif choice == "3":
        title = input("Enter title: ")
        book = library.find_book(title)
        if book:
            print("Title:", book.title)
            print("Author:", book.author)
            print("ISBN:", book.isbn)
        else:
            print("Book not found.")

    elif choice == "4":
        library.display_books()

    elif choice == "5":
        print("Goodbye!")
        break

    else:
        print("Invalid choice. Please try again.")

这个示例代码包含两个类：`Book` 和 `Library`。`Book` 类定义了图书的属性，包括书名、作者和 ISBN 号。`Library` 类定义了图书馆的操作，包括添加、删除、查找和显示图书。

在主程序中，使用一个 `while` 循环来显示菜单，接收用户的选择，然后执行相应的操作。用户可以选择添加图书、删除图书、查找图书、显示所有图书或退出程序。