Python子类构造函数调用super().__init__()用法说明

一、super的作用

1.如果子类(Puple)继承父类(Person)不做初始化，那么会自动继承父类(Person)属性name。
2.如果子类(Puple_Init)继承父类(Person)做了初始化，且不调用super初始化父类构造函数，那么子类(Puple_Init)不会自动继承父类的属性(name)。
3.如果子类(Puple_super)继承父类(Person)做了初始化，且调用了super初始化了父类的构造函数，那么子类(Puple_Super)也会继承父类的(name)属性。

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简单的神经网络实现过程/test.py", line 24, in <module>
    print(sonb.name)
AttributeError: 'SonB' object has no attribute 'name'

sonc

2.继承中super的调用顺序
继承中super的调用顺序是与MRO-C3的类方法查找顺序一样的

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()

G
E
B
F
C
D
A