重写父类的方法

我看到人们一直在做的事情是:

class Man(object):
    def say_hi(self):
        print('Hello, World.')

class ExcitingMan(Man):
    def say_hi(self):
        print('Wow!')
        super(ExcitingMan, self).say_hi()  # Calling the parent version once done with custom stuff.

我从未见过有人这样做:

class Man(object):
    def say_hi(self):
        print('Hello, World.')

class ExcitingMan(Man):
    def say_hi(self):
        print('Wow!')
        return super(ExcitingMan, self).say_hi()  # Returning the value of the call, so as to fulfill the parent class's contract.