python - How to subclass within a complicated hierarchy?

Question

If anyone can give me a better way to phrase my question in the title, I'll change it.

I'm using a library¹ and from that library I import some high level class:

from library import HighLevelClass

In the library, HighLevelClass has an attribute which is an instance of another class, and that in turn has an attribute which is an instance of yet another class, and so on...

class Bar():
    self.foobar = FooBar()

class Foo():
    self.bar = Bar()

class HighLevelClass:
    self.foo = Foo()

Now, I want to be able to replace some method of Foo for instance. I can't just do:

class MyFoo(Foo):
    def foo_method(self):

because HighLevelClass will still be referencing the Foo in the library, not my Foo.

I could try to unravel the hierarchy and subclass the HighLevelClass and make my way down to Foo subclassing everything as I go, but that's just madness.

What's the correct way to do what I'm trying to achieve?

Footnotes

¹ It doesn't really matter for the purposes of the question but here it is: facebookresearch/detectron2

question from:https://stackoverflow.com/questions/65939062/how-to-subclass-within-a-complicated-hierarchy

Answer 1

Waitting for answers