code: def send(self, name, sender=None, **kwargs):
          
          try:
              signal = self._registry[name]
          except KeyError:
              return []
  
          return signal.send(sender=sender, **kwargs)
docs: Sends the signal. Return every function response\
          that was hooked to hook-name as a list: [(func, response), ]
  
          :param str name: The hook name
          :param class sender: Optional sender __class__ to which\
          registered callback should match (see :py:func:`.connect` method)
          :return: Signal responses as a sequence of tuples (func, response)
          :rtype: list