经典Python实战项目全代码，使用Python手搓一个图书管理系统，对自己Python实战没有信心的一定要来试试，增加借阅图书、归还图书、查询图书、查看所有图书

import json

library = {}

data_file = 'library_data.json'

# 加载图书数据  
def load_library_data():  
    """从JSON文件中加载图书数据"""  
    try:  
        with open(data_file, 'r') as file:  
            global library  # 使用全局变量library  
            library = json.load(file)  # 读取JSON数据到library字典  
    except FileNotFoundError:  
        # 如果文件不存在，则初始化一个空字典  
        library = {} 

# 保存图书数据  
def save_library_data():  
    """将图书数据保存到JSON文件中"""  
    with open(data_file, 'w') as file:  
        json.dump(library, file, indent=4)  # 以缩进格式保存JSON数据  

# 添加图书  
def add_book(book_id, title, author):  
    """添加一本新书到图书馆"""  
    if book_id in library:  
        print(f"图书ID {book_id} 已存在。")  
    else:  
        library[book_id] = {"title": title, "author": author, "borrowed": False}  
        print(f"图书 {title} 已添加。")  
        save_library_data()  # 保存数据  

# 借阅图书  
def borrow_book(book_id):  
    """借阅一本图书"""  
    if book_id in library and not library[book_id]["borrowed"]:  
        library[book_id]["borrowed"] = True  
        print(f"图书 {library[book_id]['title']} 已借出。")  
        save_library_data()  # 保存数据  
    else:  
        print(f"图书ID {book_id} 不存在或已被借出。")  

# 归还图书  
def return_book(book_id):  
    """归还一本图书"""  
    if book_id in library and library[book_id]["borrowed"]:  
        library[book_id]["borrowed"] = False  
        print(f"图书 {library[book_id]['title']} 已归还。")  
        save_library_data()  # 保存数据  
    else:  
        print(f"图书ID {book_id} 不存在或未被借出。")  

# 查询图书信息  
def query_book(book_id):  
    """查询图书信息"""  
    if book_id in library:  
        book = library[book_id]  
        borrowed_status = "已借出" if book["borrowed"] else "在馆"  
        print(f"图书ID: {book_id}, 标题: {book['title']}, 作者: {book['author']}, 状态: {borrowed_status}")  
    else:  
        print(f"图书ID {book_id} 不存在。")  

# 显示所有图书  
def display_all_books():  
    """显示所有图书信息"""  
    if not library:  
        print("图书馆中没有图书。")  
    else:  
        for book_id, book in library.items():  
            borrowed_status = "已借出" if book["borrowed"] else "在馆"  
            print(f"图书ID: {book_id}, 标题: {book['title']}, 作者: {book['author']}, 状态: {borrowed_status}")

# 主函数  
def main():  
    load_library_data()  # 加载图书数据  
      
    while True:  
        print("\n图书管理系统")  
        print("1. 添加图书")  
        print("2. 借阅图书")  
        print("3. 归还图书")  
        print("4. 查询图书信息")  
        print("5. 显示所有图书")  
        print("6. 退出")  
          
        choice = input("请选择操作: ")  
          
        if choice == '1':  
            book_id = input("请输入图书ID: ")  
            title = input("请输入图书标题: ")  
            author = input("请输入图书作者: ")  
            add_book(book_id, title, author)  
        elif choice == '2':  
            book_id = input("请输入图书ID: ")  
            borrow_book(book_id)  
        elif choice == '3':  
            book_id = input("请输入图书ID: ")  
            return_book(book_id)  
        elif choice == '4':  
            book_id = input("请输入图书ID: ")  
            query_book(book_id)  
        elif choice == '5':  
            display_all_books()  
        elif choice == '6':  
            print("退出系统。")  
            break  
        else:  
            print("无效选择，请重新输入。")  
  
if __name__ == "__main__":  
    main()

# 导入必要的库
import json  # 用于存储和读取数据

# 初始化图书数据，这里使用字典来存储图书信息
library = {}

# 定义存储图书数据的文件路径
data_file = 'library_data.json'


# 加载图书数据
def load_library_data():
  """从JSON文件中加载图书数据"""
  try:
    with open(data_file, 'r') as file:
      global library  # 使用全局变量library
      library = json.load(file)  # 读取JSON数据到library字典
  except FileNotFoundError:
    # 如果文件不存在，则初始化一个空字典
    library = {}

  # 保存图书数据


def save_library_data():
  """将图书数据保存到JSON文件中"""
  with open(data_file, 'w') as file:
    json.dump(library, file, indent=4)  # 以缩进格式保存JSON数据


# 添加图书
def add_book(book_id, title, author):
  """添加一本新书到图书馆"""
  if book_id in library:
    print(f"图书ID {book_id} 已存在。")
  else:
    library[book_id] = {"title": title, "author": author, "borrowed": False}
    print(f"图书 {title} 已添加。")
    save_library_data()  # 保存数据


# 借阅图书
def borrow_book(book_id):
  """借阅一本图书"""
  if book_id in library and not library[book_id]["borrowed"]:
    library[book_id]["borrowed"] = True
    print(f"图书 {library[book_id]['title']} 已借出。")
    save_library_data()  # 保存数据
  else:
    print(f"图书ID {book_id} 不存在或已被借出。")

  # 归还图书


def return_book(book_id):
  """归还一本图书"""
  if book_id in library and library[book_id]["borrowed"]:
    library[book_id]["borrowed"] = False
    print(f"图书 {library[book_id]['title']} 已归还。")
    save_library_data()  # 保存数据
  else:
    print(f"图书ID {book_id} 不存在或未被借出。")

  # 查询图书信息


def query_book(book_id):
  """查询图书信息"""
  if book_id in library:
    book = library[book_id]
    borrowed_status = "已借出" if book["borrowed"] else "在馆"
    print(f"图书ID: {book_id}, 标题: {book['title']}, 作者: {book['author']}, 状态: {borrowed_status}")
  else:
    print(f"图书ID {book_id} 不存在。")

  # 显示所有图书


def display_all_books():
  """显示所有图书信息"""
  if not library:
    print("图书馆中没有图书。")
  else:
    for book_id, book in library.items():
      borrowed_status = "已借出" if book["borrowed"] else "在馆"
      print(f"图书ID: {book_id}, 标题: {book['title']}, 作者: {book['author']}, 状态: {borrowed_status}")

    # 主函数


def main():
  load_library_data()  # 加载图书数据

  while True:
    print("\n图书管理系统")
    print("1. 添加图书")
    print("2. 借阅图书")
    print("3. 归还图书")
    print("4. 查询图书信息")
    print("5. 显示所有图书")
    print("6. 退出")

    choice = input("请选择操作: ")

    if choice == '1':
      book_id = input("请输入图书ID: ")
      title = input("请输入图书标题: ")
      author = input("请输入图书作者: ")
      add_book(book_id, title, author)
    elif choice == '2':
      book_id = input("请输入图书ID: ")
      borrow_book(book_id)
    elif choice == '3':
      book_id = input("请输入图书ID: ")
      return_book(book_id)
    elif choice == '4':
      book_id = input("请输入图书ID: ")
      query_book(book_id)
    elif choice == '5':
      display_all_books()
    elif choice == '6':
      print("退出系统。")
      break
    else:
      print("无效选择，请重新输入。")


if __name__ == "__main__":
  main()