when going into complex version resolving, output conflicting versions

when pip outputs this message: INFO: pip is looking at multiple versions of webencodings to determine which version is compatible with other requirements. This could take a while. It does not give any information on the conflicting versions.

this requires going into constraining the versions manually and trying to find the culprit.

it would be nice to have a message describing what version conflict was found such that the compatibility search was necessary.

[tonkolviktor]

@nadavwe I had a same issue and after some searching I’ve find that pip-compile from pip-tools prints the most useful message. https://pypi.org/project/pip-tools/

As opposed to pip install, it will do some basic stuff (which in context of pip backtracking seems magical):

• It will tell you which is the conflicting dependency
• which libraries are depending on it
• best of all it is ~fast (1-2minues) not hours like pip install: https://github.com/pypa/pip/issues/9187

The only thing I do not understand why cannot the pip install use simply this, specially if it’s already available.

[nadavwe]

cool! i’ll post a pr in the upcoming days.