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The incremental code style checking is blocking automated substitutions on the source tree (like #1360 and #1361, but touching more files), since any change close to a piece of pre-existing code that is not style compliant will make pycodestyle complain. This happens so many times that correcting these manually is too much work.
After adopting Black (see #1134), there will either be no need for style checking or it can be done with a much smaller ruleset.
Contributor Checklist:
reviewto the keywords field in Trac, and putting a link to this PR in the comment; it shows up in https://twisted.reviews/ now.