class Animal():
    language = "None" # language gets a default value here
    def speak(self):
        print(self.language * 3)

class Dog(Animal):
    # Note that Dog is chosing to use the inherited speak
    # method.
    def __init__(self, name, language):
        self.name = name
        self.language = language

class Cat(Animal):
    # Note that alternatively Cat is overriding the inherited
    # speak method.
    
    name = "Kitty" # could have a default value for name
    def speak(self):
        print("meow" * 3)