Python Mixin - Unresolved Attribute Reference [PyCharm]

Question

I am using a mixin to separate a range of functionality to a different class. This Mixin is only supposed to be mixable with the only child class:

class Mixi         


        

Answer 1

I see few options.

1) Type annotations (i think this is cleanest solution):

class Mixin:
    foo: str

    def complex_operation(self):
        return self.foo.capitalize()

2) Default None (@ikamen option):

class Mixin:
    foo = None

    def complex_operation(self):
        return self.foo.capitalize()

3) Suppress unresolved reference error for class or for specific line (i think this is more dirty way than first two):

# noinspection PyUnresolvedReferences
class Mixin:
    def complex_operation(self):
        return self.foo.capitalize()

class Mixin:
    def complex_operation(self):
        # noinspection PyUnresolvedReferences
        return self.foo.capitalize()