>I have not done anything with Python, but "declaration order" sounds like dealing with some of the pains of C++.

It is the declaration order when defining the object;
def class MI(Parent1, Parent2, Parent3)

The order of parentclasses defines the search path for method name lookup, directly at the definition
And as Python is deeply dynamic, you can do really bad wizardry like monkey patching already loaded code,
but some guns I still shy away from.
In my tries I had classes with clearly defined separate tasks, so polymorphic overlap did not happen.