'Constructs a AlphaSenderContext
:param sid: The sid
:returns: twilio.rest.messaging.v1.service.alpha_sender.AlphaSenderContext
:rtype: twilio.rest.messaging.v1.service.alpha_sender.AlphaSenderContext'

def __call__(self, sid):

    return AlphaSenderContext(self._version, service_sid=self._solution['service_sid'], sid=sid)
