Observer Design Pattern in Python

ObserverPattern.py

__author__ = 'svalleru'
class Observable(object):
    def __init__(self, name):
        self._name = name
        self._observers = []
    def register_observer(self, observer):
        self._observers.append(observer)

    def notify_observers(self, msg):
        for observer in self._observers:
            observer.notify(self._name, msg)

class Observer(object):
    def __init__(self, observable, name):
        self._name = name
        observable.register_observer(self)
    def notify(self, observable, msg):
        print "{0}: {1} said {2}".format(self._name, observable, msg)

Trump = Observable('Donald Trump')
SomeRobert = Observer(Trump, 'SomeRobert')
SomeJack = Observer(Trump, 'SomeJack')
Trump.notify_observers('Hillary Clinton had been "schlonged" by Barack Obama in the 2008 Democratic primaries')

# SomeRobert: Donald Trump said Hillary Clinton had been "schlonged" by Barack Obama in the 2008 Democratic primaries
# SomeJack: Donald Trump said Hillary Clinton had been "schlonged" by Barack Obama in the 2008 Democratic primaries