Python调用父类中的方法和super()的用途

直接调用父类的super方法

class A:
    def span(self):
        print('---a---')

class B(A):
    def span(self):
        print('-----b-----')
        super().span()

b = B()
print(b.span())

调用父类的init()方法，确保父类被正确初始化

class C:
    def __init__(self):
        self.x = 1

class D(C):
    def __init__(self):
        super().__init__()
        self.y = 1

d = D()
print(d.x, d.y)

当覆盖了python中的特殊方法时

class Proxy:
    def __init__(self, obj):
        self.obj = obj

    def __getattr__(self, name):
        return getattr(self._obj, name)

    def __setattr__(self, name, value):
        if name.startswith("_"):
            # __setattr__方法被覆盖，调用父类的原始方法
            super().__setattr__(name, value)
        else:
            setattr(self._obj, name, value)