如何在保持文件夹结构的同时复制前一天修改过的文件？

import os
import shutil
import datetime

# 源文件夹路径
source_folder = "path/to/source/folder"
# 目标文件夹路径
target_folder = "path/to/target/folder"

# 获取前一天的日期
previous_day = datetime.date.today() - datetime.timedelta(days=1)

# 递归遍历源文件夹
for root, dirs, files in os.walk(source_folder):
    # 在目标文件夹中创建相同的文件夹结构
    relative_path = os.path.relpath(root, source_folder)
    target_path = os.path.join(target_folder, relative_path)
    os.makedirs(target_path, exist_ok=True)

    # 复制前一天修改过的文件
    for file in files:
        file_path = os.path.join(root, file)
        modified_time = datetime.datetime.fromtimestamp(os.path.getmtime(file_path)).date()
        if modified_time == previous_day:
            target_file_path = os.path.join(target_path, file)
            shutil.copy2(file_path, target_file_path)

print("复制完成！")