super()

class Inventory:
    def __init__(self):
        self.slots = []

    def add_item(self, item):
        self.slots.append(item)

class SortedInventory(Inventory):
    def add_item(self, item):
        super().add_item(item)

a = SortedInventory()
a.add_item(2)
print (a.slots)

class C(B):
    def method(self, arg):
        super().method(arg)    # This does the same thing as:
                               # super(C, self).method(arg)

class Fish:
class Fish(object):
    def __init__(self):
        print("In Fish class")

    def swim(self):
        print("The fish is swimming.")

    def swim_backwards(self):
        print("The fish can swim backwards.")


class Trout(Fish):
    def __init__(self):
        print ("In Trout class")
        super().__init__() # 写成super().__init__(self) 是错的！会报错！

a = Trout()