Difference between 'cls' and 'self' in Python classes?

Question

Why is cls sometimes used instead of self as an argument in Python classes?

For example:

class Person:
    def __init__(sel         


        

Answer 1

It's used in case of a class method. Check this reference for further details.

EDIT: As clarified by Adrien, it's a convention. You can actually use anything but cls and self are used (PEP8).