MRO About super()

[catlessness]

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class A():     def __init__(self):         print('enter A')         print('leave A')     class B(A):     def __init__(self):         print('enter B')         super().__init__()         print('leave B')     class C(A):     def __init__(self):         print('enter C')         super().__init__()         print('leave C')     class D(B, C):     def __init__(self):         print('enter D')         super().__init__()         print('leave D') d=D()

why the result is:
enter D
enter B
enter C
enter A
leave A
leave C
leave B
leave D
NOT:
enter D
enter B
enter A
leave A
leave B
enter C
enter A
leave A
leave C
leave D
Thank you!

[Gribouillis]

Python uses C3 superclass linearization since version 2.3. This algorithm is described in many places. You can access the method resolution order directly with the mro() method

1 2	>>> D.mro() [<class '__main__.D'>, <class '__main__.B'>, <class '__main__.C'>, <class '__main__.A'>, <class 'object'>]