animals.py

# the Mammal class represents a generic mammal.

class Mammal:
    # the __init__ method accepts an argument for
    # the mammal's species.
    def __init__(self, species):
        self.__species=species
        
    # the show_species method displays a message.
    # indicating the mammal's species.
    
    def show_species(self):
        print("I am a", self.__species)
        
    # the make_sound method is the mammal's
    # way of making a generic sound.
    def make_sound(self):
        print("Grrrrrr")
        
# the Dog class is a subclass of the Mammal class.
class Dog(Mammal):
    # the __init__ method calls for the superclass's
    # __init__ method passing "Dog" as the species.
    
    def __init__(self):
        Mammal.__init__(self, "Dog")
        
    # the make_sound method overrides the superclass's 
    # make_sound method
    def make_sound(self):
        print("Woof! Woof!")
        
# the Cat class is a subclass of the Mammal class.
class Cat(Mammal):
# the __init__ method calls the superclass's
# __init__ method passing 'Cat' as the species.
    def __init__(self):
        Mammal.__init__(self, 'Cat')

# the make_sound method overrides the superclass's
# make_sound method.

    def make_sound(self):
        print('Meow')