'Access the alpha_senders
:returns: twilio.rest.messaging.v1.service.alpha_sender.AlphaSenderList
:rtype: twilio.rest.messaging.v1.service.alpha_sender.AlphaSenderList'

@property
def alpha_senders(self):

    if (self._alpha_senders is None):
        self._alpha_senders = AlphaSenderList(self._version, service_sid=self._solution['sid'])
    return self._alpha_senders
