ImportError：无法从“pip._internal.exceptions”导入名称“InvalidSchemeCombination”

Question

I am quite new to programming so don't be mad if I get something wrong. I updated pip to its latest version (something like 21.xx) and I tried to install the Detectron2 Git repo. But anything related with pip (even when checking its version) I get the following Traceback:

Traceback (most recent call last):
  File "/Users/user/opt/anaconda3/bin/pip", line 7, in <module>
    from pip._internal.cli.main import main
  File "/Users/user/opt/anaconda3/lib/python3.8/site-packages/pip/_internal/cli/main.py", line 8, in <module>
    from pip._internal.cli.autocompletion import autocomplete
  File "/Users/user/opt/anaconda3/lib/python3.8/site-packages/pip/_internal/cli/autocompletion.py", line 9, in <module>
    from pip._internal.cli.main_parser import create_main_parser
  File "/Users/user/opt/anaconda3/lib/python3.8/site-packages/pip/_internal/cli/main_parser.py", line 7, in <module>
    from pip._internal.cli import cmdoptions
  File "/Users/user/opt/anaconda3/lib/python3.8/site-packages/pip/_internal/cli/cmdoptions.py", line 22, in <module>
    from pip._internal.cli.progress_bars import BAR_TYPES
  File "/Users/user/opt/anaconda3/lib/python3.8/site-packages/pip/_internal/cli/progress_bars.py", line 9, in <module>
    from pip._internal.utils.logging import get_indentation
  File "/Users/user/opt/anaconda3/lib/python3.8/site-packages/pip/_internal/utils/logging.py", line 14, in <module>
    from pip._internal.utils.misc import ensure_dir
  File "/Users/user/opt/anaconda3/lib/python3.8/site-packages/pip/_internal/utils/misc.py", line 29, in <module>
    from pip._internal.locations import get_major_minor_version, site_packages, user_site
  File "/Users/user/opt/anaconda3/lib/python3.8/site-packages/pip/_internal/locations/__init__.py", line 9, in <module>
    from . import _distutils, _sysconfig
  File "/Users/user/opt/anaconda3/lib/python3.8/site-packages/pip/_internal/locations/_sysconfig.py", line 8, in <module>
    from pip._internal.exceptions import InvalidSchemeCombination, UserInstallationInvalid
ImportError: cannot import name 'InvalidSchemeCombination' from 'pip._internal.exceptions' (/Users/user/opt/anaconda3/lib/python3.8/site-packages/pip/_internal/exceptions.py)

Is there a solution for my problem? I also tried downgrading to an earlier version but as I said any comment with pip inside gives me this Traceback...

If anyone out there can help me I would be so grateful!

Answer 1

I was having the same error after upgrading to pip 20.xx, there is a solution on GitHub( https://github.com/pypa/pip/issues/5599 ) which helped me to understand the problem, but it doesn't help me. So let's come to the solution

Solution

1. Manually remove or delete the pip file and pip-20.2.4-py3.7.egg-info file from the directory, which in your case is located in /Users/user/opt/anaconda3/lib/python3.7/site-packages and for some it's in /home/user/anaconda3/lib/python3.7/site-packages .

2. Now use conda remove --force pip to completely remove pip from your system.

3. Finally, use conda install -c anaconda pip to install pip in your anaconda environment.

For me, it worked, hope it will work for you too

best of luck