delete init

book_manager.py

@@ -5,10 +5,6 @@ from datetime import datetime
 class BookManager:
     """图书管理类，负责图书信息的增删改查操作"""
     
-    def __init__(self, data_file='books.json'):
-        """初始化图书管理器，加载已有图书数据"""
-        self.data_file = data_file
-        self.books = self._load_books()
     
     def _load_books(self):
         """从文件加载图书数据"""