D6971: formatting: blacken the codebase

[durin42 (Augie Fackler)]

durin42 added a comment.
durin42 planned changes to this revision.


  This still causes check-code problems, but it's getting close.

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