Python子類構造函數調用super().__init__()用法說明

1、super的做用

1.若是子類(Puple)繼承父類(Person)不作初始化，那麼會自動繼承父類(Person)屬性name。
2.若是子類(Puple_Init)繼承父類(Person)作了初始化，且不調用super初始化父類構造函數，那麼子類(Puple_Init)不會自動繼承父類的屬性(name)。
3.若是子類(Puple_super)繼承父類(Person)作了初始化，且調用了super初始化了父類的構造函數，那麼子類(Puple_Super)也會繼承父類的(name)屬性。

class Father():
    def __init__(self,name = 'father'):
        self.name = name


class SonA(Father):
    pass

class SonB(Father):
    def __init__(self,age ):
        self.age = age

class SonC(Father):
    def __init__(self,name,age ):

        self.age = age
        self.name = name
        super(SonC, self).__init__(name)


sona = SonA()
print(sona.name)

sonb = SonB(10)
print(sonb.name)

sonc = SonC('sonc',10)
print(sonc.name)

father

Traceback (most recent call last):
  File "C:/Users/wiggin/PycharmProjects/AI/1簡單的神經網絡實現過程/test.py", line 24, in <module>
    print(sonb.name)
AttributeError: 'SonB' object has no attribute 'name'

sonc

2.繼承中super的調用順序
繼承中super的調用順序是與MRO-C3的類方法查找順序同樣的

class A:
    def __init__(self):
        print('A')
        
class B(A):
    def __init__(self):
        print('B')
        super().__init__()

class C(A):
    def __init__(self):
        print('C')
        super().__init__()

class D(A):
    def __init__(self):
        print('D')
        super().__init__()
        
class E(B, C):
    def __init__(self):
        print('E')
        super().__init__()


class F(C, D):
    def __init__(self):
        print('F')
        super().__init__()

class G(E, F):
    def __init__(self):
        print('G')
        super().__init__()

g = G()

GEBFCDA