python super原理,不是指父类

class a(object):
    def __init__(self):
        print(‘in a‘)
class b(a):
    def __init__(self):
        print(‘in b‘)
        super().__init__()
        print(‘out b‘)
class c(a):
    def __init__(self):
        print(‘in c‘)
        super().__init__()
        print(‘out c‘)

class d(b, c):
    def __init__(self):
        print(‘in d‘)
        super().__init__()
        print(‘out d‘)

a = d()
print(a.__class__.mro())

[Running] python "d:\pyqt5\signal.py"
in d
in b
in c
in a
out c
out b
out d
(<class ‘__main__.d‘>, <class ‘__main__.b‘>, <class ‘__main__.c‘>, <class ‘__main__.a‘>, <class ‘object‘>)

def super(cls, inst):
    mro = inst.__class__.mro()
    return mro[mro.index(cls) + 1]