Read-the-docs build fails with “cannot import name 'PackageFinder' from 'pip._internal.index'”

[brunorijsman]

Details

• Read the Docs project URL: https://readthedocs.org/projects/cascade-python/
• Build URL (if applicable): https://readthedocs.org/projects/cascade-python/builds/10300025/
• Read the Docs username (if applicable): brunorijsman

Expected Result

Build succeeds

Actual Result

Build fails with following error message:

ImportError: cannot import name 'PackageFinder' from 'pip._internal.index' (/home/docs/checkouts/readthedocs.org/user_builds/cascade-python/envs/latest/lib/python3.7/site-packages/pip/_internal/index/init.py)

Additional details

Stackoverflow discussion: https://stackoverflow.com/questions/59846065

One stackoverflow user hypothesized that it is related to the recent release of pip 20.0.0 followed immediately by hotpath 20.0.1

[stsewd]

Please check #6554

[brunorijsman]

Thanks. The fix described in #6554 worked for me. I answered my own stack overflow question with the fix.