no-self-use / R6301

Message emitted:

Method could be a function

Description:

Used when a method doesn't use its bound instance, and so could be written as a function.

Problematic code:

class Person:
    def greeting(self):  # [no-self-use]
        print("Greetings pythonista!")

Correct code:

function.py:

def greeting():
    print("Greetings pythonista!")

staticmethod.py:

class Person:
    @staticmethod
    def greeting():
        print("Greetings pythonista!")

use_self.py:

class Person:
    name: str = "Amelia"

    def greeting(self):
        print(f"Greetings {self.name} the pythonista!")

Configuration file:

[MAIN]
load-plugins=pylint.extensions.no_self_use,

Additional details:

If a function is not using any class attribute it can be a @staticmethod, or a function outside the class.

Note

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

Created by the no_self_use checker.