Run black on .py files (with git-blame-ignore-revs)
#575
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This makes
blackhappy, andgit blamewon't be cluttered by the commit withblackchanges. This works in the GitHub UI out of the box, and locally after runninggit config blame.ignoreRevsFile .git-blame-ignore-revsonce.This PR also fixes some minor issues identified by
pydocstyle. There is no good automated formatter for docstrings (blackdoesn't touch them, anddocformattertouches only summary lines and descriptions, which is a small fraction of content). So in anticipation of adding CI in the future, this makes the following check pass:This is all that can be done with automated tooling. xref gh-533 for context.