ImportError: cannot import name 'InvalidSchemeCombination' from 'pip._internal.exceptions'

pip报错

from pip._internal.exceptions import InvalidSchemeCombination, UserInstallationInvalid
ImportError: cannot import name 'InvalidSchemeCombination' from 'pip._internal.exceptions' (C:\Python38\lib\site-packages\pip\_internal\exceptions.py)

 

下载bootstrap.pypa.io/get-pip.py，python get-pip.py安装成功

之后成功解决