MRO About super()

[catlessness]

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

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