[mikepurvis]

Python typically goes with `cls`, particularly in conjunction with the `@classmethod` decorator.

[qwsxyh]

Python code uses both.

[mikepurvis]

Um, not really. PEP8 explicitly says to use `cls`:

https://www.python.org/dev/peps/pep-0008/#function-and-metho...

[qwsxyh]

https://github.com/python/cpython/search?utf8=%E2%9C%93&q=kl...