class ObserverPattern(object):
"""Demonstrates the observer pattern."""
def __init__(self):
self.nora = Human("Nora")
self.cat = Cat("Mona")
self.nora.adopt_cat(self.cat)
def demonstrate(self):
self.cat.be_a_cat()
def __init__(self):
self.nora = Human("Nora")
self.cat = Cat("Mona")
self.nora.adopt_cat(self.cat)