invalid-slots / E0238

Message emitted:

Invalid __slots__ object

Description:

Used when an invalid __slots__ is found in class. Only a string, an iterable or a sequence is permitted.

Problematic code:

class Person:  # [invalid-slots]
    __slots__ = 42

Correct code:

class Person:
    __slots__ = ("name", "age")

Created by the classes checker.