def remove_listener(self, callback):
        """
        Remove a listener.
        """
        listeners = filter(lambda x: x['callback'] == callback, self.listeners)
        for l in listeners:
            self.listeners.remove(l)
def remove_listener ( self , callback ) : listeners = filter ( lambda x : x [ 'callback' ] == callback , self . listeners ) for l in listeners : self . listeners . remove ( l )
Remove a listener.