python 图书管理系统 代码

### 回答1：
下面是一个简单的 Python 图书管理系统的代码示例：

# 定义图书类
class Book:
    def __init__(self, title, author, price):
        self.title = title
        self.author = author
        self.price = price

# 定义图书管理器类
class BookManager:
    def __init__(self):
        self.books = []
    
    # 添加图书
    def add_book(self, book):
        self.books.append(book)
    
    # 删除图书
    def delete_book(self, book):
        self.books.remove(book)
    
    # 查询图书
    def search_book(self, title):
        for book in self.books:
            if book.title == title:
                return book
        return None
    
    # 显示所有图书
    def show_all_books(self):
        for book in self.books:
            print(f'《{book.title}》 by {book.author} : ${book.price}')

# 创建图书管理器对象
book_manager = BookManager()

# 创建图书对象并添加到图书管理器中
book1 = Book('图书1', '作者1', 100)
book_manager.add_book(book1)
book2 = Book('图书2', '作者2', 200)
book_manager.add_book(book2)
book3 = Book('图书3', '作者3', 300)
book_manager.add_book(book3)

# 显示所有图书
book_manager.show_all_books()

# 搜索图书
book = book_manager.search_book('图书2')
if book is not None:
    print(f'找到了《{book.title}》这本书')
else:
    print('没有找到这本书')

# 删除图书
book_manager.delete_book(book2)

# 再次显示所有图书
book_manager.show_all_books()

这个图书管理系统实现了图书的增加、删除、查询和显示功能。首先定义了 `Book` 类表

### 回答2：
Python图书管理系统代码实例如下：

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

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

    def add_book(self, book):
        self.books.append(book)
        print("图书添加成功！")

    def remove_book(self, book):
        if book in self.books:
            self.books.remove(book)
            print("图书删除成功！")
        else:
            print("图书不存在！")

    def search_book(self, keyword):
        found_books = []
        for book in self.books:
            if keyword.lower() in book.title.lower() or keyword.lower() in book.author.lower():
                found_books.append(book)
        if len(found_books) > 0:
            print("以下是您搜索到的图书：")
            for book in found_books:
                print(f"标题：{book.title}，作者：{book.author}")
        else:
            print("未找到相关图书！")

def main():
    library = Library()

    book1 = Book("Python入门教程", "张三")
    library.add_book(book1)

    book2 = Book("Python高级编程", "李四")
    library.add_book(book2)

    book3 = Book("数据结构与算法", "王五")
    library.add_book(book3)

    library.search_book("python")

if __name__ == "__main__":
    main()

以上代码定义了一个图书类Book，包含了书名和作者信息。图书馆类Library包含了添加图书、删除图书和搜索图书等功能。在main函数中，创建了一个图书馆对象，并添加了三本书。最后进行了一次以关键字"python"进行搜索的操作。