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  1.  
  2. class Event:
  3. def __init__(self):
  4. self.handlers = set()
  6. def handle(self, handler):
  7. self.handlers.add(handler)
  8. return self
  10. def unhandle(self, handler):
  11. try:
  12. self.handlers.remove(handler)
  13. except:
  14. raise ValueError("Handler is not handling this event, so cannot unhandle it.")
  15. return self
  17. def fire(self, *args, **kargs):
  18. for handler in self.handlers:
  19. handler(*args, **kargs)
  21. def getHandlerCount(self):
  22. return len(self.handlers)
  24. __iadd__ = handle
  25. __isub__ = unhandle
  26. __call__ = fire
  27. __len__ = getHandlerCount
  28.  
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