简易图书管理系统python

下是一个简单的图书管理系统的Python代码示例：

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

def main():
    library = Library()

    book1 = Book("The Catcher in the Rye", "J.D. Salinger", "9780316769174")
    book2 = Book("To Kill a Mockingbird", "Harper Lee", "9780061120084")
    book3 = Book("1984", "George Orwell", "9780451524935")

    library.add_book(book1)
    library.add_book(book2)
    library.add_book(book3)

    print("Welcome to the library!")

    while True:
        print("1. Search for a book")
        print("2. Add a book")
        print("3. Remove a book")
        print("4. Quit")

        choice = input("Enter your choice: ")

        if choice == "1":
            title = input("Enter the title of the book: ")
            book = library.search_book(title)
            if book:
                print(f"{book.title} by {book.author} (ISBN: {book.isbn})")
            else:
                print(f"{title} not found in the library.")
        elif choice == "2":
            title = input("Enter the title of the book: ")
            author = input("Enter the author of the book: ")
            isbn = input("Enter the ISBN of the book: ")
            book = Book(title, author, isbn)
            library.add_book(book)
            print(f"{title} added to the library.")
        elif choice == "3":
            title = input("Enter the title of the book: ")
            book = library.search_book(title)
            if book:
                library.remove_book(book)
                print(f"{book.title} removed from the library.")
            else:
                print(f"{title} not found in the library.")
        elif choice == "4":
            print("Goodbye!")
            break
        else:
            print("Invalid choice. Please try again.")

if __name__ == "__main__":
    main()

这个程序包括两个类，`Book` 和 `Library`。`Book` 表示一本书，包括标题、作者和 ISBN 号。`Library` 表示图书馆，包括一个 `books` 列表，可以添加、删除和搜索图书。

在 `main()` 函数中，首先创建一个空的图书馆，然后添加三本书。接下来，使用一个无限循环让用户选择要做什么。如果用户选择搜索书籍，则输入书名并在图书馆中搜索。如果用户选择添加书籍，则输入书名、作者和 ISBN 号，并将新书添加到图书馆中。如果用户选择删除书籍，则输入书名并在图书馆中删除。如果用户选择退出，则退出程序。