调用父级的父方法,该方法已由父级重写

Question

如果在继承链中被另一个类覆盖,那么如何在继承链上调用多个类的方法呢？

class Grandfather(object):
    def __init__(self):
        pass

    def do_thing(self):
        # stuff

class Father(Grandfather):
    def __init__(self):
        super(Father, self).__init__()

    def do_thing(self):
        # stuff different than Grandfather stuff

class Son(Father):
    def __init__(self):
        super(Son, self).__init__()

    def do_thing(self):
        # how to be like Grandfather?

Answer 1

如果你总是想要Grandfather#do_thing,不管是否Grandfather是Father直接的超类,那么你可以显式调用Grandfather#do_thing该Son self对象:

class Son(Father):
    # ... snip ...
    def do_thing(self):
        Grandfather.do_thing(self)

另一方面,如果你想调用超类的do_thing方法Father,不管Grandfather你是否应该使用super(如Thierry的答案):

class Son(Father):
    # ... snip ...
    def do_thing(self):
        super(Father, self).do_thing()

Answer 2

你可以这样做:

class Son(Father):
    def __init__(self):
        super(Son, self).__init__()

    def do_thing(self):
        super(Father, self).do_thing()