运行celery后没有received task字样，在ready 这一行就停住了

tasks.py :

import time
from celery import Celery

broker = 'redis://:123456@localhost:6379/1'
backend= 'redis://:123456@localhost:6379/2' #存储结果
app = Celery('my_task', broker = broker, backend=backend )


@app.task
def add(x,y):
    print('enter call func......')
    time.sleep(4)
    return x+y

app.py

if __name__ == '__main__':
    print('start task...')
    result = add.delay(2,8)
    print("end task...")
    print result