python 备份文件，从 D盘 到Z盘。并且保留15天的文件

备份文件，从 D盘 到Z盘。并且保留15天的文件

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import os import shutil from datetime import datetime, timedelta   def move_and_clean_folders(a_folder, b_folder, keep_count=15):     try:         # 获取前两天的日期         yesterday = datetime.now() - timedelta(days=2)         yesterday_str = yesterday.strftime('%Y-%m-%d')           # 构建昨天的文件夹路径         source_folder = os.path.join(a_folder, yesterday_str)           # 检查昨天的文件夹是否存在         if not os.path.exists(source_folder):             print("Yesterday's folder does not exist.")             return           # 将昨天的文件夹剪切到 b 文件夹         destination_folder = os.path.join(b_folder, yesterday_str)         shutil.move(source_folder, destination_folder)         print(f"Moved folder {source_folder} to {destination_folder}")           # 在 b 文件夹中保留最近的 keep_count 个文件夹，按文件名排序         folder_list = sorted([os.path.join(b_folder, d) for d in os.listdir(b_folder)                               if os.path.isdir(os.path.join(b_folder, d))], key=lambda x: os.path.basename(x))                   # 删除除了最新的 keep_count 个文件夹之外的所有文件夹         for folder in folder_list[:-keep_count]:             shutil.rmtree(folder)             print(f"Deleted folder {folder}")       except Exception as e:         print(f"An error occurred: {e}")   # 设置文件夹路径 a_folder = r"D:\自动备份\备份文件2" b_folder = r"z:\自动备份\备份文件2"   # 调用函数 业务库 move_and_clean_folders(a_folder, b_folder, 15)     # 设置文件夹路径 挖掘库 a_folder = r"D:\自动备份\备份文件1" b_folder = r"z:\自动备份\备份文件1"   # 调用函数 move_and_clean_folders(a_folder, b_folder, 15)