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

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.x.x) 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!

I have the same problem after running some conda updates. It seems conda and pip have conflicted here. Maybe a reinstall will solve the problem. — mm49307, May 08 '21 at 12:23
Thanks for your comment! Do you mean reinstalling conda? Because I can't reinstall pip or downgrade to another version... — SchmidtiT, May 08 '21 at 12:50
Thank you very much! That helped and everything is working now :) — SchmidtiT, May 10 '21 at 12:00

kriptonian · Answer 1 · 2021-09-09T09:43:07.660

I was having the same error after upgrading to pip 20.x.x, 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

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

Thank you very much! That's the way to go. You have to reinstall conda and everything works fine again. — SchmidtiT, May 13 '21 at 09:32

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

1 Answers1

Solution