too-few-public-methods: warn only for the parent class

[praiskup]

Steps to reproduce

Given a file test.py:

#! /usr/bin/python3

# pylint: disable=missing-module-docstring

class Hello: # pylint: disable=too-few-public-methods
    """
    Some local class, but reproduced with external wtforms.FlaskForm, too.
    """

class World(Hello):
    """
    reported here:
    too-few-public-methods: Too few public methods (0/2)
    """
    def __init__(self):
        self.test = 0

Current behavior

Result of pylint /tmp/test.py:

************* Module test
/tmp/test.py:10:0: R0903: Too few public methods (0/1) (too-few-public-methods)

------------------------------------------------------------------
Your code has been rated at 7.50/10 (previous run: 7.69/10, -0.19)

Expected behavior

No error. When we inherit from some library class, no matter how many public
methods it provides, it should be acceptable to not add any more public
methods. One can e.g. only override some private method, some static class
attribute, rewrite __init__, ...

It isn't convenient to disable this warning for each class, and it is a pitty to
disable this for the whole project.

pylint --version output

Result of pylint --version output:

pylint 2.6.0
astroid 2.4.2
Python 3.9.4 (default, Apr  6 2021, 00:00:00)
[GCC 11.0.1 20210324 (Red Hat 11.0.1-0)]

[Pierre-Sassoulas]

This make sense, thank you for opening the issue. We're also thinking about disabling this one by default in #3512

[Avasam]

Upping this one, I like the rule but it happens so often with Flask

[alpaziz]

Hello,
Hope everyone is well. Would there happen to be any updates on resolving this issue?

The too-few-public-methods is an important check, so we would like to include it in our project, however on top of praiskup’s point the check does not seem smart enough to detect the Parent Class‘s inherited public methods in the Child Class, when the Parent Class is being imported.

E.g.

#hello.py
class Hello:
    def hello(self):
        print('Hi')

    def goodbye(self):
         print(‘Bye’)

#world.py

from hello import Hello

class World(Hello):
    def __greeting(self):
        print('How are you?')

The above still throws the too-few-public-methods issue for Child Class World

[Pierre-Sassoulas]

Hello, no one worked on it yet, but we welcome all contributions and will review proposals in (hopefully) a timely manner :)