如何根据上次修改的内容对目录进行排序？

import os

# 获取目录中所有文件的修改时间戳
def get_file_modified_time(directory):
    files = os.listdir(directory)
    file_modified_time = {}
    for file in files:
        file_path = os.path.join(directory, file)
        if os.path.isfile(file_path):
            modified_time = os.path.getmtime(file_path)
            file_modified_time[file] = modified_time
    return file_modified_time

# 根据文件的修改时间戳对目录进行排序
def sort_directory_by_modified_time(directory, ascending=True):
    file_modified_time = get_file_modified_time(directory)
    sorted_files = sorted(file_modified_time.items(), key=lambda x: x[1], reverse=not ascending)
    for i, (file, _) in enumerate(sorted_files):
        new_file_path = os.path.join(directory, f"{i+1}_{file}")
        old_file_path = os.path.join(directory, file)
        os.rename(old_file_path, new_file_path)

# 示例用法
directory_path = "/path/to/directory"
sort_directory_by_modified_time(directory_path, ascending=True)