写出简易图书管理系统的代码

编写一个简单的图书管理系统，我们可以使用Python的面向对象编程（OOP）来实现。这里是一个基本的结构，假设我们主要关注书籍的基本信息（如标题、作者和出版年份），以及添加、删除和查询图书的功能。注意，这个例子不会包含图形用户界面（GUI），通常会用在命令行环境中。

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

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

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

    def remove_book(self, title):
        for book in self.books:
            if book.title == title:
                self.books.remove(book)
                break

    def search_book(self, title):
        found_books = [book for book in self.books if book.title == title]
        if found_books:
            return found_books
        else:
            return "Book not found."

# 使用示例
library = Library()
book1 = Book("The Great Gatsby", "F. Scott Fitzgerald", 1925)
book2 = Book("To Kill a Mockingbird", "Harper Lee", 1960)

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

print("Library:")
books = library.search_book("To Kill a Mockingbird")
if books:
    for book in books:
        print(f"{book.title} by {book.author}, published: {book.publication_year}")
else:
    print(books)

# 删除一本书
library.remove_book("The Great Gatsby")

# 再次搜索
books = library.search_book("The Great Gatsby")
print("After removal:")
if books:
    print("Book not found.")
else:
    print("Book removed successfully.")