import time

from redis import StrictRedis
import json

rc = StrictRedis(host='localhost', port=6379, db=0)
ps = rc.pubsub()
ps.subscribe('jqr:msg')

msg_list = []

batch_size = 2
while True:
    for item in ps.listen():
        if item['type'] == 'message':
            data = item.get('data')
            print(data)
            msg_list.append(data)
            if len(msg_list) >= batch_size:
                try:
                    time.sleep(1)
                    msg_list = msg_list[-batch_size:]
                except Exception as e:
                    print(e)
            print(len(msg_list))