Say, I have some MainClass which at some point in its methods has instantiation of an object of a OtherClass as an attribute of the MainClass.
mainobj = MainClass()
isinstance(mainobj.otherclassobj, OtherClass) == True
Now, I want to extend the OtherClass, and then use the MainClass with new extended class.
Do I have more convenient options, other than extending MainClass and redefining all of its methods which instantiate self.otherclassobj to do it from ExtendedOtherClass?
If you do not need OtherClass already, you can do something like
from other_class_module import ExtendedOtherClass as OtherClass
If you need both classes, or logic/method changed - you need to reimplement/extend MainClass.
If you can change the implementation of MainClass slightly, you don't need to inherit from it. Just have something like
class MainClass:
def __init__(self, ..., otherclass=OtherClass):
self.otherclassobj = otherclass()
...
...
Then MainClass will by default use OtherClass, but you can pass in ExtendedOtherClass as a keyword argument.
