ex42.py

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

	def __init__(self, name):
        ## dog has-a name
		self.name = name
		
	def speak(self):
		print "%s: Woof!" % self.name

## Cat is-a Animal
class Cat(Animal):

	def __init__(self, name):
		## Cat has-a name
		self.name = name
		
	def speak(self):
		print "%s: Meow..." % self.name
		
## Person is-a object
class Person(object):

	def __init__(self, name):
		## Person has-a name
		self.name = name

		## Person has-a pet of some kind
		self.pet = None
	
	def speak(self):
		return "%s: To be or not to be?" % self.name

## Employee is-a person
class Employee(Person):

	def __init__(self, name, salary):
		## ?? hmm what is this strange magic?
		super(Employee, self).__init__(name)
		## Employee has-a salary
		self.salary = salary
	
	def speak(self):
		print "%s: How may I help you?" % self.name

## Fish is-a object
class Fish(object):
    pass

## Salmon is-a Fish
class Salmon(Fish):
    pass

## Halibut is-a Fish
class Halibut(Fish):
    pass


## rover is-a Dog
rover = Dog("Rover")

## Satan is-a Cat that has-a name "Satan"
satan = Cat("Satan")

## mary is-a Person that has-a name "Mary"
mary = Person("Mary")

## mary has-a pet satan
mary.pet = satan

## frank  is-a Employee that has-a name "Frank" and salary 120000
frank = Employee("Frank", 120000)

## frank has-a pet rover
frank.pet = rover

## flipper is-a Fish
flipper = Fish()

## crouse is-a Salmon
crouse = Salmon()

## harry is-a Halibut
harry = Halibut()

rover.speak()
satan.speak()
frank.speak()