bad-classmethod-argument / C0202#
Class method %s should have %s as first argument
Used when a class method has a first argument named differently than the value specified in valid-classmethod-first-arg option (default to "cls"), recommended to easily differentiate them from regular instance methods.
class Klass: @classmethod def get_instance(cls): return cls()
class Klass: @classmethod def get_instance(self): # [bad-classmethod-argument] return self()
Created by the classes checker.