python3.6升级pip21.1后导致不兼容报错NoReturn解决方法

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本文介绍了解决Python3.6升级pip至21.1版本后出现的兼容性问题。通过降级pip版本，修复了由于导入错误导致的程序崩溃，并提供了详细的步骤说明。

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pip21 报错处理，降级

python3.6升级pip21.1后导致不兼容，

Traceback (most recent call last):
File "C:\Program Files\Python36\Lib\runpy.py", line 193, in _run_module_as_main
"__main__", mod_spec)
File "C:\Program Files\Python36\Lib\runpy.py", line 85, in _run_code
exec(code, run_globals)
File "C:\Users\40122\Envs\py3_flask\Scripts\pip.exe\__main__.py", line 4, in <module>
File "c:\users\40122\envs\py3_flask\lib\site-packages\pip\_internal\cli\main.py", line 9, in <module>
from pip._internal.cli.autocompletion import autocomplete
File "c:\users\40122\envs\py3_flask\lib\site-packages\pip\_internal\cli\autocompletion.py", line 10, in <module>
from pip._internal.cli.main_parser import create_main_parser
File "c:\users\40122\envs\py3_flask\lib\site-packages\pip\_internal\cli\main_parser.py", line 8, in <module>
from pip._internal.cli import cmdoptions
File "c:\users\40122\envs\py3_flask\lib\site-packages\pip\_internal\cli\cmdoptions.py", line 30, in <module>
from pip._internal.utils.hashes import STRONG_HASHES
File "c:\users\40122\envs\py3_flask\lib\site-packages\pip\_internal\utils\hashes.py", line 2, in <module>
from typing import TYPE_CHECKING, BinaryIO, Dict, Iterator, List, NoReturn
ImportError: cannot import name 'NoReturn'