In this PR:
pycodestyle was disabled in trunk in order to make it easier to merge changes
and not have pycodestyle error out, due to the code not meeting existing Twisted style guidelines.
So this means that the old pycodestyle is not enforced in trunk.
In this PR:
if the entire tree is reformatted, then we can add that git SHA for the PR which reformats
the tree, so that that revision will be ignored during a `git blame`.
There is this pending (over 1 year) PR to add black to CI:
There are some comments in there related to documentation changes.
Can the non-documentation changes be pulled out of PR 1134 and merged to trunk now?