python file not working for replacement

[cxwx]

repeat create new header for python file by not replate the modify time like below

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# copyright https://mit-license.org
# File              : aa.py
# Author            : chenxu <chenxu@mail.ustc.edu.cn>
# Date              : 3 2021-06-16 22:58:57
# Last Modified Date: 3 2021-06-16 22:58:57
# Last Modified By  : chenxu <chenxu@mail.ustc.edu.cn>
# -*- coding: utf-8 -*-
# copyright https://mit-license.org
# File              : aa.py
# Author            : chenxu <chenxu@mail.ustc.edu.cn>
# Date              : 3 2021-06-16 22:58:56
# Last Modified Date: 3 2021-06-16 22:58:56
# Last Modified By  : chenxu <chenxu@mail.ustc.edu.cn>
# -*- coding: utf-8 -*-
# copyright https://mit-license.org
# File              : aa.py
# Author            : chenxu <chenxu@mail.ustc.edu.cn>
# Date              : 3 2021-06-16 22:58:56
# Last Modified Date: 3 2021-06-16 22:58:56
# Last Modified By  : chenxu <chenxu@mail.ustc.edu.cn>
...