在循环中删除超过x天的文件，而不使用find unix

import os
import time

def delete_files(directory, threshold_days):
    current_time = time.time()
    threshold_seconds = threshold_days * 24 * 60 * 60

    for root, dirs, files in os.walk(directory):
        for file in files:
            file_path = os.path.join(root, file)
            file_modified_time = os.path.getmtime(file_path)
            file_age = current_time - file_modified_time

            if file_age > threshold_seconds:
                os.remove(file_path)

# 调用函数删除超过7天的文件
delete_files('/path/to/directory', 7)