bad-dunder-name / W3201

Message emitted:

Bad or misspelled dunder method name %s.

Description:

Used when a dunder method is misspelled or defined with a name not within the predefined list of dunder names.

Problematic code:

class Apples:
    def _init_(self):  # [bad-dunder-name]
        pass

    def __hello__(self):  # [bad-dunder-name]
        print("hello")

Correct code:

class Apples:
    def __init__(self):
        pass

    def hello(self):
        print("hello")

Configuration file:

[MAIN]
load-plugins=pylint.extensions.dunder

Note

This message is emitted by the optional 'dunder' checker, which requires the pylint.extensions.dunder plugin to be loaded.

Created by the dunder checker.