D6971: formatting: blacken the codebase

[indygreg (Gregory Szorc)]

indygreg added inline comments.

INLINE COMMENTS

> durin42 wrote in __init__.py:1
> I'm not sold, honestly: we've already substantially diverged from upstream on this, so I think we should just act like we own it for now.

We need to take some upstream Python 3 changes soon. Can we defer this directory until we do that in case there are merge conflict issues?

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D6971/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D6971

To: durin42, indygreg, martinvonz, #hg-reviewers
Cc: mjpieters, Kwan, mercurial-devel