Python and Pip giving unexpected errors in build

[hrishikesh-k]

Describe the bug:

Reported by user on the forums.

When using pipfile, the build appears to fail (in installing Python dependencies phase) with the following error on focal:

ModuleNotFoundError: No module named 'pip._vendor.certifi'

and on xenial:

ImportError: No module named weakref

Both are using Python 2.7, but the error occurs when trying to use Python 3.8 on focal too. Since it fails in dependency installation phase, there is not much a user can do to create or fix this error.

Also, the same works when using requirements.txt instead of pipfile.

Repo to test: https://github.com/Hrishikesh-K/netlify-test

Configuration:

• Did you run your build through the UI or the CLI?: UI

Deploy logs:

focal: https://app.netlify.com/sites/keen-wiles-29d30e/deploys/61a8e53f4e2d862aa8977c72
xenial: https://app.netlify.com/sites/keen-wiles-29d30e/deploys/61acc95a9622e8adc53b1d8c