pyee supplies an EventEmitter object similar to the EventEmitter from Node.js.
In : from pyee import EventEmitter In : ee = EventEmitter() In : @ee.on('event') ...: def event_handler(): ...: print 'BANG BANG' ...: In : ee.emit('event') BANG BANG In :
sudo pip install pyee
ee.on(event, f=None): Registers the function f to the event name event. Example:
If f is not specified, ee.on returns a function that takes f as a callback, which allows for decorator styles:
@ee.on('data') def data_handler(data): print data
ee.emit(event, *args, **kwargs): Emits the event, calling the attached functions with *args. For example:
This will call data('00101001')' (assuming data is an attached function). Returns False if no functions are attached to handle the emission (otherwise True).
ee.once(event, f=None): The same as ee.on, except that the listener is automatically removed after it's called.
ee.remove_listener(event, fxn): Removes the function fxn from event. Requires that the function is not closed over by ee.on (using this with the decorator style is unfortunately not possible).
ee.remove_all_listeners(event): Removes all listeners from event.
ee.listeners(event): Returns the array of all listeners registered to the given event.
"new_listener": Fires whenever a new listener is created. Listeners for this event do not fire upon their own creation.
"error": When emitted raises an Exception by default, behavior can be overriden by attaching callback to the event. For example:
@ee.on('error') def onError(message): logging.err(message) ee.emit('error', Exception('something blew up'))