使用Python写一个图书管理系统

好的，以下是一个简单的图书管理系统的Python代码：

class Book:
    def __init__(self, title, author, genre, year, num_copies):
        self.title = title
        self.author = author
        self.genre = genre
        self.year = year
        self.num_copies = num_copies

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 display_books(self):
        for book in self.books:
            print("Title:", book.title)
            print("Author:", book.author)
            print("Genre:", book.genre)
            print("Year:", book.year)
            print("Number of Copies:", book.num_copies)
            print()

def main():
    library = Library()

    book1 = Book("The Great Gatsby", "F. Scott Fitzgerald", "Classic", 1925, 5)
    book2 = Book("To Kill a Mockingbird", "Harper Lee", "Classic", 1960, 3)
    book3 = Book("1984", "George Orwell", "Science Fiction", 1949, 2)

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

    library.display_books()

    book_to_remove = library.search_book("1984")
    library.remove_book(book_to_remove)

    print("After removing 1984:")
    library.display_books()

if __name__ == '__main__':
    main()

以上代码实现了一个简单的图书管理系统，包括添加图书、删除图书、搜索图书和展示图书信息等功能。用户可以根据需要自行添加其他功能。