Kind of tackling the tasks step by step, picking low-hanging fruit first,
or the ones that everyone depends on

There is more work to do though, as many imports are still incorrect.
Also, there are still print statements

autopep8 -v -j 8 --max-line-length 120 --in-place --recursive

This allows to deal with the previous UTC issue without manually reversing
timezone adjustments

Commandline was
autopep8 -j 8 --max-line-length 120 --in-place --recursive --exclude "*gitdb*,*async*" git/

W291 trailing whitespace

E201 whitespace after '('
E202 whitespace before ')'
E203 whitespace before ':'
E225 missing whitespace around operator
E226 missing whitespace around arithmetic operator
E227 missing whitespace around bitwise or shift operator
E228 missing whitespace around modulo operator
E231 missing whitespace after ','
E241 multiple spaces after ','
E251 unexpected spaces around keyword / parameter equals

E301 expected 1 blank line, found 0
E302 expected 2 blank lines, found 1
E303 too many blank lines (n)