code: def sessions(self):
          
          if self._sessions is None:
              self._sessions = SessionList(self._version, service_sid=self._solution['sid'], )
          return self._sessions
docs: Access the sessions
  
          :returns: twilio.rest.proxy.v1.service.session.SessionList
          :rtype: twilio.rest.proxy.v1.service.session.SessionList