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备份文件，从 D盘 到Z盘。并且保留15天的文件

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)