Simple and dirty EventDispatcher implementation in Python.

dispatcher.py

class EventDispatcher(object):
    def __init__(self):
        self._events = {}

    def on(self, type, handler):
        handlers = self._events.setdefault(type, [])
        handlers.append(handler)

    def emit(self, type, *args, **kwargs):
        try:
            for handler in self._events.get(type):
                handler(*args, **kwargs)
        except:
            pass
    
    def off(self, type, handler):
        try:
            self._events.get(type).remove(handler)
        except:
            pass