How to use the jpush.alias function in jpush

jpush.options(options)

    if user_ids is None:
        push.audience = jpush.all_
        return str(push.send())
    elif len(user_ids) > 1000:
        ans = []
        for i in range(len(user_ids) // 1000 + 1):
            ret = send_push(msg, user_ids[i * 1000: (i + 1) * 1000])
            ans.append(ret)
        return ans
    elif len(user_ids) == 0:
        return ''
    else:
        push.audience = jpush.audience(
                jpush.alias(*user_ids)
                )
        return str(push.send())

def test_audience(self):
        _jpush = jpush.JPush(app_key, master_secret)

        push = _jpush.create_push()
        push.audience = jpush.audience(
            jpush.tag("tag1", "tag2"),
            jpush.alias("alias1", "alias2")
        )
        push.notification = jpush.notification(alert="Hello world with audience!")
        push.platform = jpush.all_
        try:
            response = push.send()
            print response.status_code
            self.assertEqual(response.status_code, 200)
        except common.Unauthorized, e:
            self.assertFalse(isinstance(e, common.Unauthorized))
            raise common.Unauthorized("Unauthorized")
        except common.APIConnectionException, e:
            self.assertFalse(isinstance(e, common.APIConnectionException))
            raise common.APIConnectionException("conn")
        except common.JPushFailure, e:
            self.assertFalse(isinstance(e, common.JPushFailure))
            print "JPushFailure"

def audience():
    push = _jpush.create_push()

    push.audience = jpush.audience(
                jpush.tag("tag1", "tag2"),
                jpush.alias("alias1", "alias2")
            )


    push.notification = jpush.notification(alert="Hello world with audience!")
    push.platform = jpush.all_
    print (push.payload)
    push.send()

import jpush as jpush
from conf import app_key, master_secret
_jpush = jpush.JPush(app_key, master_secret)
_jpush.set_logging("DEBUG")
push = _jpush.create_push()

push.audience = jpush.audience(
            jpush.tag("tag1", "tag2"),
            jpush.alias("alias1", "alias2")
        )


push.notification = jpush.notification(alert="Hello world with audience!")
push.platform = jpush.all_
print (push.payload)
push.send()