Major Description
Avro uses spotless for java, but its implementation hasn't been rolled out to other languages yet. Spotless has support for black, the python formatter, but the lang/py implementation doesn't use black yet.
I propose to do a conversion of the python implementation to black, including
1. Reformatting everything.
2. Replacing pycodestyle with black in as the basic linter.
3. Maybe enabling spotless to run the black check on Python, if it makes sense.