用python写一个图书管理系统，且有代码注释

好的，以下是用Python实现的图书管理系统：

# 图书管理系统

# 定义一个图书类
class Book:
    def __init__(self, book_id, title, author, publisher, publish_date):
        self.book_id = book_id
        self.title = title
        self.author = author
        self.publisher = publisher
        self.publish_date = publish_date

# 定义一个图书管理系统类
class Library:
    def __init__(self):
        self.books = []

    # 添加图书
    def add_book(self, book):
        self.books.append(book)

    # 删除图书
    def remove_book(self, book_id):
        for book in self.books:
            if book.book_id == book_id:
                self.books.remove(book)
                return True
        return False

    # 查找图书
    def search_book(self, keyword):
        result = []
        for book in self.books:
            if keyword in book.title or keyword in book.author or keyword in book.publisher:
                result.append(book)
        return result

    # 显示所有图书
    def display_books(self):
        for book in self.books:
            print("ID: {}, Title: {}, Author: {}, Publisher: {}, Publish Date: {}".format(book.book_id, book.title, book.author, book.publisher, book.publish_date))

# 测试程序

# 创建一个图书管理系统对象
library = Library()

# 添加图书
book1 = Book(1, "Python入门教程", "张三", "人民邮电出版社", "2020-01-01")
book2 = Book(2, "Java编程思想", "李四", "机械工业出版社", "2020-02-01")
book3 = Book(3, "C++程序设计", "王五", "清华大学出版社", "2020-03-01")
library.add_book(book1)
library.add_book(book2)
library.add_book(book3)

# 显示所有图书
library.display_books()

# 删除图书
library.remove_book(2)

# 显示所有图书
library.display_books()

# 查找图书
result = library.search_book("Python")
for book in result:
    print("ID: {}, Title: {}, Author: {}, Publisher: {}, Publish Date: {}".format(book.book_id, book.title, book.author, book.publisher, book.publish_date))

这个程序实现了一个简单的图书管理系统，具有添加、删除、查找、显示所有图书的功能。通过定义`Book`类和`Library`类来实现，其中`Library`类维护了一个`books`列表来存储所有的图书对象。在测试程序中，我们创建一个`Library`对象，添加三本图书，并展示所有图书。接着，我们删除了一本图书并再次展示所有图书。最后，我们查找包含关键字“Python”的图书，并展示结果。

希望这个程序对你有帮助！