Unresolved reference during inheritance

Question

import pygame
from pygame.sprite import Sprite


class FooObject(Sprite):
    def __init__(self):
        Sprite.__init__(self)
    
    def do_stuff(self):
        ...doing stuff
    
    
objects = pygame.sprite.Group()
my_obj = FooObject()
objects.add(my_obj)


for obj in objects:
    obj.do_stuff()

The code works fine. However, last line Pycharm gives me a warning:

Unresolved attribute reference 'do_stuff' for class 'Sprite'

Very understandable, normally i would just put a placeholder method in the super-class that gets overwritten by the inheriting class. However, the Sprite class isnt mine and i dont want to mess with it, so what is the recommended course of action here? Ignore the warning?

Answer 1

You could check for existence of the method before calling:

for obj in objects:
    if hasattr(obj, 'do_stuff'):
        obj.do_stuff()

or

for obj in objects:
    if isinstance(obj, FooObject):
        obj.do_stuff()

where FooObject could be the child class of all children having a do_stuff member.

Edit: From the comments it could be usefull to create an intermediate abstract class, named ActiveStripe for grouping all descendants having a do_stuff member.