# Animal is-a object (yes, sort of confusing) look at the extra credit
class Animal(object):
    pass

# is-a
class Dog(Animal):
    def __init__(self, name):
        ## has-a
        self.name = name

# is-a
class Cat(Animal):
    
    def __init__(sefl, name):
        # has-a
        self.name = name
        
# is-a
class Person(object):
    
    def __init__(self, name):
        # has-a
        self.name = name
        
        ## Person has-a a pet of some kind
        self.pet = None
        
# is-a
class Emplyee(Person):
    
    def __init__(sefl, name, salary):
        ## ? hmm what is this strange magic?
        super(Emplyee, slef).__init__(name)
        ## has-a
        self.salary = salary
        
# is-a
class Fish(object):
    pass

# is-a
class Salmon(Fish):
    pass
    
# is-a
class Halibut(Fish):
    pass
    
# rover is-a Dog
rover = Dog("Rover")

# has-a
satan = Cat("Satan")

# has-a
mary = Person("Mary")

# has-a
mary.pet = satan

# has-a
frank = Employee("Frank", 120000)

# has-a
frank.pet = rover

# is-a
flipper = Fish()

# is-a
crouse = Salmon()

# is-a
harry = Halibut()