Unable to install anything using pip after upgrade to 20.0

Environment

• pip version: 20.0
• Python version: 3.6.8
• OS: Ubuntu 14.04.6 (Don’t judge)

Description

During our build process, we automatically upgrade to the newest version on pip. After upgrading to 20.0 (using pip install -U pip setuptools), we are unable to install any packages.

Output

Traceback (most recent call last):
  File "/home/svc-web/webshop/env/bin/pip", line 8, in <module>
    sys.exit(main())
  File "/home/svc-web/webshop/env/lib/python3.6/site-packages/pip/_internal/cli/main.py", line 73, in main
    command = create_command(cmd_name, isolated=("--isolated" in cmd_args))
  File "/home/svc-web/webshop/env/lib/python3.6/site-packages/pip/_internal/commands/__init__.py", line 96, in create_command
    module = importlib.import_module(module_path)
  File "/usr/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/svc-web/webshop/env/lib/python3.6/site-packages/pip/_internal/commands/install.py", line 24, in <module>
    from pip._internal.cli.req_command import RequirementCommand
  File "/home/svc-web/webshop/env/lib/python3.6/site-packages/pip/_internal/cli/req_command.py", line 20, in <module>
    from pip._internal.operations.prepare import RequirementPreparer
  File "/home/svc-web/webshop/env/lib/python3.6/site-packages/pip/_internal/operations/prepare.py", line 16, in <module>
    from pip._internal.distributions import (
  File "/home/svc-web/webshop/env/lib/python3.6/site-packages/pip/_internal/distributions/__init__.py", line 1, in <module>
    from pip._internal.distributions.source import SourceDistribution
ImportError: cannot import name 'SourceDistribution'

[ntoll]

It’s worth mentioning that mistakes, problems and unforeseen mishaps happen to all projects, no matter how much you plan and try to mitigate such events.

Spare a thought and supportive comments for the volunteer Pythonistas looking into this and fixing it for all our benefit.

[kushaldas]

Do you not listen to your own CI tests?

Always remember that the maintainers are also humans, and programming mistakes are actually common among this species. We should be providing any support they or the community need than blaming people.