Composition test

composition test

# posted as a comment to this stackoverflow question: 
# http://stackoverflow.com/questions/16502315/python-how-to-change-a-module-implementation/16502490#16502490
# when the SpottedDog constructor is called, results in infinite recursion

class Dog(object):
  """docstring for Dog"""
	def __init__(self, name):
		self.name = name

	def growl(self):
		return "grrrr" + self.name + "grrr"


class SpottedDog(object):
	def __init__(self, dog):
		self._internal = dog
		#self.spots = 3

	def __getattr__(self, attr):
		getattr(self._internal, attr)

	def __setattr__(self, attr, value):
		setattr(self._internal, attr, value)