#tasks.py
from celery import Celery
app = Celery('tasks', broker='redis://localhost:6379/0', backend='redis://localhost')
@app.task
def add(x, y):
    return x + y

In [1]: from tasks import add
In [2]: r = add.delay(1,3)
In [3]: r.status
Out[3]: 'PENDING'
In [4]: r.get(timeout=1)
---------------------------------------------------------------------------
TimeoutError                              Traceback (most recent call last)
<ipython-input-4-ade09ca12a13> in <module>()
----> 1 r.get(timeout=1)
C:\Python27\lib\site-packages\celery\result.pyc in get(self, timeout, propagate, interval, no_ack, follow_parents, EXCEPTION_STATES, PROPAGATE_STATES)
    167             interval=interval,
    168             on_interval=on_interval,
--> 169             no_ack=no_ack,
    170         )
    171         if meta:
C:\Python27\lib\site-packages\celery\backends\base.pyc in wait_for(self, task_id,
timeout, interval, no_ack, on_interval)
    223             time_elapsed += interval
    224             if timeout and time_elapsed >= timeout:
--> 225                 raise TimeoutError('The operation timed out.')
    226
    227     def prepare_expires(self, value, type=None):
TimeoutError: The operation timed out.

$ celery -A tasks worker --loglevel=info
[2015-01-09 15:02:25,540: WARNING/MainProcess] C:\Python27\lib\site-packages\celery\apps\worker.py:161: CDeprecationWarning:
Starting from version 3.2 Celery will refuse to accept pickle by default.
The pickle serializer is a security concern as it may give attackers
the ability to execute any command.  It's important to secure
your broker from unauthorized access when using pickle, so we think
that enabling pickle should require a deliberate action and not be
the default choice.
If you depend on pickle then you should set a setting to disable this
warning and to be sure that everything will continue working
when you upgrade to Celery 3.2::
    CELERY_ACCEPT_CONTENT = ['pickle', 'json', 'msgpack', 'yaml']
You must only enable the serializers that you will actually use.
  warnings.warn(CDeprecationWarning(W_PICKLE_DEPRECATED))
 -------------- celery@sandbox v3.1.17 (Cipater)
---- **** -----
--- * ***  * -- Windows-7-6.1.7601-SP1
-- * - **** ---
- ** ---------- [config]
- ** ---------- .> app:         tasks:0x3168cb0
- ** ---------- .> transport:   redis://localhost:6379/0
- ** ---------- .> results:     redis://localhost:6379/0
- *** --- * --- .> concurrency: 4 (prefork)
-- ******* ----
--- ***** ----- [queues]
 -------------- .> celery           exchange=celery(direct) key=celery
[tasks]
  . tasks.add
[2015-01-09 15:02:25,694: INFO/MainProcess] Connected to redis://localhost:6379/0
[2015-01-09 15:02:25,717: INFO/MainProcess] mingle: searching for neighbors
[2015-01-09 15:02:26,757: INFO/MainProcess] mingle: all alone
[2015-01-09 15:02:26,770: WARNING/MainProcess] celery@sandbox ready.
[2015-01-09 15:03:00,915: INFO/MainProcess] Received task: tasks.add[23a79244-3713-49ec-b246-65791b1af1db]
[2015-01-09 15:03:00,936: INFO/MainProcess] Task tasks.add[23a79244-3713-49ec-b246-65791b1af1db] succeeded in 0.018000125885s: 9
ajib6ept@SANDBOX /c/tests
$ celery -A tasks worker --loglevel=info
[2015-01-09 15:04:32,867: WARNING/MainProcess] C:\Python27\lib\site-packages\celery\apps\worker.py:161: CDeprecationWarning:
Starting from version 3.2 Celery will refuse to accept pickle by default.
The pickle serializer is a security concern as it may give attackers
the ability to execute any command.  It's important to secure
your broker from unauthorized access when using pickle, so we think
that enabling pickle should require a deliberate action and not be
the default choice.
If you depend on pickle then you should set a setting to disable this
warning and to be sure that everything will continue working
when you upgrade to Celery 3.2::
    CELERY_ACCEPT_CONTENT = ['pickle', 'json', 'msgpack', 'yaml']
You must only enable the serializers that you will actually use.
  warnings.warn(CDeprecationWarning(W_PICKLE_DEPRECATED))
 -------------- celery@sandbox v3.1.17 (Cipater)
---- **** -----
--- * ***  * -- Windows-7-6.1.7601-SP1
-- * - **** ---
- ** ---------- [config]
- ** ---------- .> app:         tasks:0x3128230
- ** ---------- .> transport:   redis://localhost:6379/0
- ** ---------- .> results:     redis
- *** --- * --- .> concurrency: 4 (prefork)
-- ******* ----
--- ***** ----- [queues]
 -------------- .> celery           exchange=celery(direct) key=celery
[tasks]
  . tasks.add
[2015-01-09 15:04:33,029: INFO/MainProcess] Connected to redis://localhost:6379/0
[2015-01-09 15:04:33,068: INFO/MainProcess] mingle: searching for neighbors
[2015-01-09 15:04:34,117: INFO/MainProcess] mingle: all alone
[2015-01-09 15:04:34,141: WARNING/MainProcess] celery@sandbox ready.
[2015-01-09 15:05:47,092: INFO/MainProcess] Received task: tasks.add[6ea3a7d3-3bf0-4b15-9797-d76bca772335]
[2015-01-09 15:05:47,109: INFO/MainProcess] Task tasks.add[6ea3a7d3-3bf0-4b15-9797-d76bca772335] succeeded in 0.0169999599457s: 2
ajib6ept@SANDBOX /c/tests
$ celery -A tasks worker --loglevel=info
[2015-01-09 15:09:01,660: WARNING/MainProcess] C:\Python27\lib\site-packages\celery\apps\worker.py:161: CDeprecationWarning:
Starting from version 3.2 Celery will refuse to accept pickle by default.
The pickle serializer is a security concern as it may give attackers
the ability to execute any command.  It's important to secure
your broker from unauthorized access when using pickle, so we think
that enabling pickle should require a deliberate action and not be
the default choice.
If you depend on pickle then you should set a setting to disable this
warning and to be sure that everything will continue working
when you upgrade to Celery 3.2::
    CELERY_ACCEPT_CONTENT = ['pickle', 'json', 'msgpack', 'yaml']
You must only enable the serializers that you will actually use.
  warnings.warn(CDeprecationWarning(W_PICKLE_DEPRECATED))
 -------------- celery@sandbox v3.1.17 (Cipater)
---- **** -----
--- * ***  * -- Windows-7-6.1.7601-SP1
-- * - **** ---
- ** ---------- [config]
- ** ---------- .> app:         tasks:0x2fc7d30
- ** ---------- .> transport:   redis://localhost:6379/0
- ** ---------- .> results:     disabled
- *** --- * --- .> concurrency: 4 (prefork)
-- ******* ----
--- ***** ----- [queues]
 -------------- .> celery           exchange=celery(direct) key=celery
[tasks]
  . tasks.add
[2015-01-09 15:09:01,861: INFO/MainProcess] Connected to redis://localhost:6379/0
[2015-01-09 15:09:01,908: INFO/MainProcess] mingle: searching for neighbors
[2015-01-09 15:09:02,957: INFO/MainProcess] mingle: all alone
[2015-01-09 15:09:02,977: WARNING/MainProcess] celery@sandbox ready.
[2015-01-09 15:09:25,253: INFO/MainProcess] Received task: tasks.add[3c70f504-3ab4-4af0-8de3-f5517e55c4c1]
[2015-01-09 15:09:25,269: INFO/MainProcess] Task tasks.add[3c70f504-3ab4-4af0-8de3-f5517e55c4c1] succeeded in 0.0149998664856s: 3
ajib6ept@SANDBOX /c/tests
$ celery -A tasks worker --loglevel=info
[2015-01-09 15:10:04,460: WARNING/MainProcess] C:\Python27\lib\site-packages\celery\apps\worker.py:161: CDeprecationWarning:
Starting from version 3.2 Celery will refuse to accept pickle by default.
The pickle serializer is a security concern as it may give attackers
the ability to execute any command.  It's important to secure
your broker from unauthorized access when using pickle, so we think
that enabling pickle should require a deliberate action and not be
the default choice.
If you depend on pickle then you should set a setting to disable this
warning and to be sure that everything will continue working
when you upgrade to Celery 3.2::
    CELERY_ACCEPT_CONTENT = ['pickle', 'json', 'msgpack', 'yaml']
You must only enable the serializers that you will actually use.
  warnings.warn(CDeprecationWarning(W_PICKLE_DEPRECATED))
 -------------- celery@sandbox v3.1.17 (Cipater)
---- **** -----
--- * ***  * -- Windows-7-6.1.7601-SP1
-- * - **** ---
- ** ---------- [config]
- ** ---------- .> app:         tasks:0x2ff8d30
- ** ---------- .> transport:   redis://localhost:6379/0
- ** ---------- .> results:     redis://localhost
- *** --- * --- .> concurrency: 4 (prefork)
-- ******* ----
--- ***** ----- [queues]
 -------------- .> celery           exchange=celery(direct) key=celery
[tasks]
  . tasks.add
[2015-01-09 15:10:04,625: INFO/MainProcess] Connected to redis://localhost:6379/0
[2015-01-09 15:10:04,644: INFO/MainProcess] mingle: searching for neighbors
[2015-01-09 15:10:05,769: INFO/MainProcess] mingle: all alone
[2015-01-09 15:10:05,790: WARNING/MainProcess] celery@sandbox ready.
[2015-01-09 15:10:16,173: INFO/MainProcess] Received task: tasks.add[16aea070-ac69-4f5b-8100-4e5fc87de5fe]
[2015-01-09 15:10:16,183: INFO/MainProcess] Task tasks.add[16aea070-ac69-4f5b-8100-4e5fc87de5fe] succeeded in 0.0090000629425s: 4