invalid-getnewargs-returned / E0312

Message emitted:

__getnewargs__ does not return a tuple

Description:

Used when a __getnewargs__ method returns something which is not a tuple

Problematic code:

class CustomGetNewArgs:
    """__getnewargs__ returns an integer"""

    def __getnewargs__(self):  # [invalid-getnewargs-returned]
        return 1

Correct code:

class CustomGetNewArgs:
    """__getnewargs__ returns <type 'tuple'>"""

    def __getnewargs__(self):
        return (1, 2)

Created by the classes checker.