Retrieve task result by id in Celery

This is due to RabbitMQ not actually storing the results. If you need the ability to get the results later on, use redis or SQL as the result backend.

It works using AsyncResult. (see this answer)

So first create the task:

from cel.tasks import add

res = add.delay(3,4)
print(res.status) # 'SUCCESS'
print(res.id) # '432890aa-4f02-437d-aaca-1999b70efe8d'

Then start another python shell:

from celery.result import AsyncResult
from cel.tasks import app

res = AsyncResult('432890aa-4f02-437d-aaca-1999b70efe8d',app=app)

print(res.state) # 'SUCCESS'
print(res.get()) # 7