[Python] Class objects in MRO in python

I'm trying to understand Python's inheritance model. This is the example I'm using:

class A:
def a_m(self):
print("A.a_m")


class B(A):
def b_m(self):
print("B.b_m")


b = B()
print(b.__class__)
print(b.__class__.__mro__)

$ python cl.py

<class '__main__.B'>
(<class '__main__.B'>, <class '__main__.A'>, <class 'object'>)


Based on the output, I've drawn the following diagram:



Can you confirm it's correct?

I'm coming from the JavaScript background, where inheritance model is a lot more cumbersome. Here's the diagram I put together to demonstrate the difference with just one class A:



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