beautifulsoup, html5lib: module object has no attribute _base

This is an issue with upstream package html5lib: https://bugs.launchpad.net/beautifulsoup/+bug/1603299 To fix, force downgrade to an older version:

pip install --upgrade html5lib==1.0b8

I upgraded beautifulsoup4 and html5lib and it resolved the issue.

pip install --upgrade beautifulsoup4
pip install --upgrade html5lib