Unresolved reference during inheritance-CodePudding

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?

CodePudding user response：

You could check for existence of the method before calling:

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

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.