Python/ex45.py at master · WuXiYaShe/Python · GitHub

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

class Dog(Animal):
	def __init__(self,name):
		self.name = name

class Cat(Animal):
	"""docstring for Cat"""
	def __init__(self, name):
		self.name = name


class Person(object):
	def __init__(self, name):
		self.name = name
		self.pet = None

class Employee(Person):
	def __init__(self, name,salary):
		super(Employee,self).__init__(name)
		self.salary = salary


class Fish(object):
	pass

class Salmon(Fish):
	pass

class Halibut(Fish):
	pass


rover = Dog("Rover")
satan = Cat("Satan")
mary = Person("Mary")

mary.pet = satan
frank = Employee("Frank",120000)
frank.pet = rover

flipper = Fish()

crouse = Salmon()
harry = Halibut()