* Remove __metaclass__ = type.
for i in $(grep -REl '__metaclass__ = type' plugins/ tests/); do
sed -e '/^__metaclass__ = type/d' -i $i;
done
* Remove super arguments, and stop inheriting from object.
* Adjust all __future__ imports:
for i in $(grep -REl "__future__.*absolute_import" plugins/ tests/); do
sed -e 's/from __future__ import .*/from __future__ import annotations/g' -i $i;
done
* Remove all UTF-8 encoding specifications for Python source files:
for i in $(grep -REl '[-][*]- coding: utf-8 -[*]-' plugins/ tests/); do
sed -e '/^# -\*- coding: utf-8 -\*-/d' -i $i;
done
* Reformat.
* Remove unicode text prefixes.
* Replace str.format() uses with f-strings.
* Replace % with f-strings, and do some cleanup.
* Fix wrong variable.
* Avoid unnecessary string conversion.
