导入错误：无法从 'pip._vendor.retrying' (c:\python39\lib\site-packages\pip\_vendor\retrying.py) 导入名称 'retry'

Question

Traceback (most recent call last):
  File "c:\python39\lib\runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "c:\python39\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Python39\Scripts\pip.exe\__main__.py", line 4, in <module>
  File "c:\python39\lib\site-packages\pip\_internal\cli\main.py", line 8, in <module>
    from pip._internal.cli.autocompletion import autocomplete
  File "c:\python39\lib\site-packages\pip\_internal\cli\autocompletion.py", line 9, in <module>
    from pip._internal.cli.main_parser import create_main_parser
  File "c:\python39\lib\site-packages\pip\_internal\cli\main_parser.py", line 7, in <module>
    from pip._internal.cli import cmdoptions
  File "c:\python39\lib\site-packages\pip\_internal\cli\cmdoptions.py", line 22, in <module>
    from pip._internal.cli.progress_bars import BAR_TYPES
  File "c:\python39\lib\site-packages\pip\_internal\cli\progress_bars.py", line 9, in <module>
    from pip._internal.utils.logging import get_indentation
  File "c:\python39\lib\site-packages\pip\_internal\utils\logging.py", line 14, in <module>
    from pip._internal.utils.misc import ensure_dir
  File "c:\python39\lib\site-packages\pip\_internal\utils\misc.py", line 25, in <module>
    from pip._vendor.retrying import retry  # type: ignore
ImportError: cannot import name 'retry' from 'pip._vendor.retrying' (c:\python39\lib\site-packages\pip\_vendor\retrying.py)

ImportError: cannot import name 'retry' from 'pip._vendor.retrying' (c:\python39\lib\site-packages\pip\_vendor\retrying.py)

重点关注这里的错误。

当我遇到上述错误时，我正在尝试安装 ffmpeg python 模块。有什么办法可以解决吗？

以前好像还可以，只是现在因为一些奇怪的原因不行了。