sirgazil via Bug reports for GNU Guix <bug-guix@gnu.org> writes:

> I couldn't upgrade the packages in my user profile because "emacs-elpy" check phase fails. 
>
>
> ## Steps to reproduce
>
> 1. guix pull
> 2. guix build emacs-elpy
>
>
> ## Unexpected result
>
>
> The output of the check phase:
>
> ---------------------------
> starting phase `check'
>
> Can’t guess python-indent-offset, using defaults: 4

This seems to stem from the update of 'python-black' in
5f603fab23e7df7e7b76566b3add24b65e92f807.  Reverting that commit makes
this package build.

@Ricardo: Any objections to reverting the commit?