code: def disconnect(self, token):
          
          topic = token['topic']
          try:
              arr = self._connects[topic]
          except KeyError:
              return
          arr.remove(token['cb'])
          if len(arr) == 0:
              del self._connects[topic]
docs: Unregisters a callback for an event topic.
  
          @param token: Token of the callback to unregister
          @type token: dict