code: def all(self, campaign_id, get_all=False, **queryparams):
          
          self.campaign_id = campaign_id
          self.subscriber_hash = None
          if get_all:
              return self._iterate(url=self._build_path(campaign_id, 'unsubscribed'), **queryparams)
          else:
              return self._mc_client._get(url=self._build_path(campaign_id, 'unsubscribed'), **queryparams)
docs: Get information about members who have unsubscribed from a specific
          campaign.
  
          :param campaign_id: The unique id for the campaign.
          :type campaign_id: :py:class:`str`
          :param get_all: Should the query get all results
          :type get_all: :py:class:`bool`
          :param queryparams: The query string parameters
          queryparams['fields'] = []
          queryparams['exclude_fields'] = []
          queryparams['count'] = integer
          queryparams['offset'] = integer