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

So just to compiling my thoughts from the comments for everyone else: The problem is keeping the two classes intrinsically connected while separating functionality. Here are my solutions:

1) Make a module

Have another file, say mixin.py, that has complex_operation as a function. Instead of accepting self as a parameter, have it take a string:

# mixin.py

def complex_operation (foo: str) -> str: return foo.capitalize()

# main.py

from ai import complex_operation
class A: 
    def __init__(self): self.foo = "foo"
print (complex_operation (A().foo))

2) Make a class to accept another class as a parameter

In Mixin's __init__ function, add a parameter to accept an A, and then use that in its methods:

# mixin.py

class Mixin: 
    def __init__(self, a: A): self.a = a
    def complex_operation(self): return self.a.foo.capitalize()

# main.py

from mixin import Mixin
class A:
    def __init__(self): self.foo = "foo"

print (Mixin (A()).complex_operation())