bad-mcs-classmethod-argument / C0204#
Metaclass class method %s should have %s as first argument
Used when a metaclass class method has a first argument named differently than the value specified in valid-metaclass-classmethod-first-arg option (default to "mcs"), recommended to easily differentiate them from regular instance methods.
class Meta(type): @classmethod def foo(some): # [bad-mcs-classmethod-argument] pass
class Meta(type): @classmethod def foo(mcs): pass
Created by the classes checker.