图书管理系统Python 代码

图书管理系统是一个常见的项目，通常用于管理图书馆的书籍信息，包括添加新书、借阅、归还和查询等功能。下面是一个简单的Python图书管理系统的基本框架示例，使用了字典来存储书籍信息：

class Book:
    def __init__(self, id, title, author, status="available"):
        self.id = id
        self.title = title
        self.author = author
        self.status = status

class LibrarySystem:
    def __init__(self):
        self.books = {}

    # 添加新书
    def add_book(self, book_id, title, author):
        if book_id not in self.books:
            new_book = Book(book_id, title, author)
            self.books[book_id] = new_book
            print(f"Book added successfully: {title} by {author}")
        else:
            print("A book with the same ID already exists.")

    # 借书
    def borrow_book(self, book_id):
        if book_id in self.books and self.books[book_id].status == "available":
            self.books[book_id].status = "borrowed"
            print(f"{book_id} has been borrowed.")
        else:
            print("Invalid action or book is not available.")

    # 归还书
    def return_book(self, book_id):
        if book_id in self.books and self.books[book_id].status == "borrowed":
            self.books[book_id].status = "available"
            print(f"{book_id} has been returned.")
        else:
            print("Invalid action or book is not borrowed.")

    # 查询书籍信息
    def search_book(self, book_id):
        if book_id in self.books:
            book = self.books[book_id]
            print(f"Title: {book.title}, Author: {book.author}, Status: {book.status}")
        else:
            print("Book not found.")

# 使用示例
library = LibrarySystem()
library.add_book(1, "Python Crash Course", "Eric Matthes")
library.borrow_book(1)
library.search_book(1)

这个例子只是一个基本版本，实际应用中可能会增加用户身份验证、错误处理等复杂功能，并可能采用数据库来持久化数据。