Python: 'super' object has no attribute 'attribute_name'

Question

After the base class's __init__ ran, the derived object has the attributes set there (e.g. some_var) as it's the very same object as the self in the derived class' __init__. You can and should just use self.some_var everywhere. super is for accessing stuff from base classes, but instance variables are (as the name says) part of an instance, not part of that instance's class.

The attribute some_var does not exist in the Parent class.

When you set it during __init__, it was created in the instance of your Child class.