Before main merge we should reformat/lint the whole codebase

[schettn]

Describe the feature or change you'd like
By running the commands below: imports are sorted, unused imports removed and
everything is formatted by black.

isort -rc .
autoflake -r --in-place --remove-all-unused-imports --remove-unused-variables .
black .

Additional context

Ref: https://github.com/psf/black

Install instructions:

pip3 install isort
pip3 install autoflake
pip3 install black