ImportError: cannot import name 'SourceDistribution' from 'pip._internal.distributions.source'

Environment

CircleCI using Conda, eg https://circleci.com/gh/peterjc/thapbi-pict/1073

• pip version: pip-19.2.3 (from conda) updated to 19.3 (via pip install --upgrade pip setuptools)
• Python version: python-3.7.3
• OS: Linux

I have made only minor changes to my code, but today the CircleCI builds broke during the build/install stage of my Python tool - multiple branches affected. The timing fits the release of pip 19.3 on PyPI.

Description

It appears a recent release of pip moved some internal files about, my guess is #6830.

Expected behavior

How to Reproduce

Full output on https://circleci.com/gh/peterjc/thapbi-pict/1073 which is running https://github.com/peterjc/thapbi-pict/blob/9fcec2da60e6e6ae5cf7ee6ad4b53dcc3a40cfe7/.circleci/config.yml#L56

...
python setup.py sdist --formats=gztar
python setup.py bdist_wheel
pip install dist/thapbi_pict-*.whl

Output

Traceback (most recent call last):
  File "/opt/conda/bin/pip", line 7, in <module>
    from pip._internal import main
  File "/opt/conda/lib/python3.7/site-packages/pip/_internal/__init__.py", line 40, in <module>
    from pip._internal.cli.autocompletion import autocomplete
  File "/opt/conda/lib/python3.7/site-packages/pip/_internal/cli/autocompletion.py", line 8, in <module>
    from pip._internal.cli.main_parser import create_main_parser
  File "/opt/conda/lib/python3.7/site-packages/pip/_internal/cli/main_parser.py", line 11, in <module>
    from pip._internal.commands import (
  File "/opt/conda/lib/python3.7/site-packages/pip/_internal/commands/__init__.py", line 9, in <module>
    from pip._internal.commands.download import DownloadCommand
  File "/opt/conda/lib/python3.7/site-packages/pip/_internal/commands/download.py", line 10, in <module>
    from pip._internal.operations.prepare import RequirementPreparer
  File "/opt/conda/lib/python3.7/site-packages/pip/_internal/operations/prepare.py", line 9, in <module>
    from pip._internal.distributions import (
  File "/opt/conda/lib/python3.7/site-packages/pip/_internal/distributions/__init__.py", line 1, in <module>
    from pip._internal.distributions.source import SourceDistribution
ImportError: cannot import name 'SourceDistribution' from 'pip._internal.distributions.source' (/opt/conda/lib/python3.7/site-packages/pip/_internal/distributions/source/__init__.py)
Exited with code 1

[pradyunsg]

Thanks @PabloCastellano! I’m just ignoring comments here now, since I don’t want my heartrate going any higher. 😃

Made the bugfix release. If that helped, use 👍 on this post. Otherwise, please write a comment with the error message.

[PabloCastellano]

Please stop reporting “me too”. @pradyunsg is working on a fix right now