Fix uncontroversial flake8 warnings #23
Merged
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Hopefully this set of flake8 fixes is uncontroversial.
There are a few more "unused local variable" warnings that I'll have to look at more closely.
Next, I'll tackle a raft of "unused import" errors. I saw test errors when doing the obvious thing and just removing all the unused imports, so I'll have to try again more carefully.