Pip fails

I am trying to install several python packages using pip. All attempts to use pip (even pip list) result in:

pip list
Traceback (most recent call last):
File "/usr/bin/pip", line 6, in
from pip._internal.cli.main import main
File "/usr/lib/python3.8/site-packages/pip/_internal/__init__.py", line 40, in
from pip._internal.cli.autocompletion import autocomplete
File "/usr/lib/python3.8/site-packages/pip/_internal/cli/autocompletion.py", line 8, in
from pip._internal.cli.main_parser import create_main_parser
File "/usr/lib/python3.8/site-packages/pip/_internal/cli/main_parser.py", line 11, in
from pip._internal.commands import (
File "/usr/lib/python3.8/site-packages/pip/_internal/commands/__init__.py", line 6, in
from pip._internal.commands.completion import CompletionCommand
File "/usr/lib/python3.8/site-packages/pip/_internal/commands/completion.py", line 6, in
from pip._internal.cli.base_command import Command
File "/usr/lib/python3.8/site-packages/pip/_internal/cli/base_command.py", line 26, in
from pip._internal.index import PackageFinder
ImportError: cannot import name 'PackageFinder' from 'pip._internal.index' (/usr/lib/python3.8/site-packages/pip/_internal/index/__init__.py)