Celery: ModuleNotFoundError: works via Terminal, not by Django

Created on 20 Jul 2018 · 3Comments · Source: celery/celery

I've been using celery for the first time since a couple of weeks already, so I'm pretty fresh to task queueing. The problem I'm currently facing is related to using celery via Django and a ModuleNotFoundErrorerror.

I'm using Django 1.11und celery 4.2.0. My files are as follows:

celery_tasks.py

from celery import Celery
from celery import task
import os

app = Celery('myapp')                         
#app.config_from_object('myapp.celeryconfig', namespace='CELERY')  # WORKS WHEN CALLED THROUGH VIEW/DJANGO: Tell Celery instance to use celeryconfig module
app.config_from_object('celeryconfig', namespace='CELERY')  # WORKS WHEN CALLED THROUGH TERMINAL

# set the default Django settings module for the 'celery' program.
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'myapp.celeryconfig')

suf = lambda n: "%d%s" % (n, {1: "st", 2: "nd", 3: "rd"}.get(n if n < 20 else n % 10, "th"))
@app.task(name='celery_tasks.fav_doctor')
def fav_doctor():
    """Reads doctor.txt file and prints out fav doctor, then  addsa new
    number to the file"""

    with open('doctor.txt', 'r+') as f:
        for line in f:
            nums = line.rstrip().split()

            print ('The {} doctor is my favorite'.format(suf(int(nums[0]))))

            for num in nums[1:]:
                print ('Wait! The {} doctor is my favorite'.format(suf(int(num))))

            last_num = int(nums[-1])
            new_last_num = last_num + 1

            f.write(str(new_last_num) + ' ')


@app.task(name='celery_tasks.reverse')
def reverse(string):
    return string[::-1]

@app.task(name='celery_tasks.add')
def add(x, y):
    return x+y


if __name__ == '__main__':
    app.start()

celeryconfig.py

from __future__ import absolute_import, unicode_literals
from datetime import timedelta

## List of modules to import when celery starts.
CELERY_IMPORTS = ['celery_tasks',]

## Message Broker (RabbitMQ) settings.
BROKER_URL = 'amqp://'
BROKER_PORT = 5672

## Result store settings.
CELERY_RESULT_BACKEND = 'rpc://' 

## Worker settings
#CELERYD_CONCURRENCY = 1
#CELERYD_TASK_TIME_LIMIT = 20
#CELERYD_LOG_FILE = 'celeryd.log'
#CELERYD_LOG_LEVEL = 'INFO'

## Misc
#CELERY_IGNORE_RESULT = False
CELERY_TASK_SERIALIZER = 'json'
CELERY_RESULT_SERIALIZER = 'json'
CELERY_ACCEPT_CONTENT=['json']
CELERY_TIMEZONE = 'Europe/Berlin'
CELERY_ENABLE_UTC = True

CELERYBEAT_SCHEDULE = {
    'doctor-every-10-seconds': {
        'task': 'celery_tasks.fav_doctor',
        'schedule': timedelta(seconds=3),
    },
}

__init__.py

from .celery_tasks import app as celery_app # Ensures app is always imported when Django starts so that shared_task will use this app.

__all__ = ['celery_app']

--> myapp
-- __init__.py
-- celery_tasks.py
-- celeryconfig.py
--> views
-- admin_scripts.py

After going into the directory where the celery files are located, and switching to the virtual env, and then type:

celery -A celery_tasks worker -l info

but ONLY with this configuration in my celery_tasks.py file:

#app.config_from_object('myapp.celeryconfig', namespace='CELERY')  # WORKS WHEN CALLED THROUGH VIEW/DJANGO: Tell Celery instance to use celeryconfig module
app.config_from_object('celeryconfig', namespace='CELERY')  # WORKS WHEN CALLED THROUGH TERMINAL

only after I reconfigure the above lines of code, can I use celery via Django, so:

app.config_from_object('myapp.celeryconfig', namespace='CELERY')  # WORKS WHEN CALLED THROUGH VIEW/DJANGO: Tell Celery instance to use celeryconfig module
#app.config_from_object('celeryconfig', namespace='CELERY')  # WORKS WHEN CALLED THROUGH TERMINAL

If I don't do this step, the error message and configure like so without changing midway through i.e.,

app.config_from_object('myapp.celeryconfig', namespace='CELERY') # WORKS WHEN CALLED THROUGH VIEW/DJANGO: Tell Celery instance to use celeryconfig module

app.config_from_object('celeryconfig', namespace='CELERY') # WORKS WHEN CALLED THROUGH TERMINAL

Then I receive this error:

[20/Jul/2018 07:03:06] ERROR [django.request:135] Internal Server Error: /myapp/adminscripts/
Traceback (most recent call last):
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/celery/local.py", line 317, in _get_current_object
    return object.__getattribute__(self, '__thing')
AttributeError: 'PromiseProxy' object has no attribute '__thing'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/kombu/utils/objects.py", line 42, in __get__
    return obj.__dict__[self.__name__]
KeyError: 'data'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/celery/loaders/base.py", line 144, in _smart_import
    return imp(path)
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/celery/loaders/base.py", line 98, in import_from_cwd
    package=package,
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/celery/utils/imports.py", line 104, in import_from_cwd
    return imp(module, package=package)
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/celery/loaders/base.py", line 92, in import_module
    return importlib.import_module(module, package=package)
  File "/Users/my_mbp/anaconda3/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 978, in _gcd_import
  File "<frozen importlib._bootstrap>", line 961, in _find_and_load
  File "<frozen importlib._bootstrap>", line 948, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'celeryconfig'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/django/core/handlers/exception.py", line 41, in inner
    response = get_response(request)
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/django/core/handlers/base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/django/core/handlers/base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/django/contrib/auth/decorators.py", line 23, in _wrapped_view
    return view_func(request, *args, **kwargs)
  File "/Users/my_mbp/Software/myapp/myappsite/myapp/views/admin_scripts.py", line 56, in admin_script_dashboard
    async_result = add.delay(24, 54) # delay() invokes the Celery, responsible for running this task asynchronously
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/celery/local.py", line 146, in __getattr__
    return getattr(self._get_current_object(), name)
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/celery/local.py", line 319, in _get_current_object
    return self.__evaluate__()
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/celery/local.py", line 349, in __evaluate__
    thing = Proxy._get_current_object(self)
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/celery/local.py", line 109, in _get_current_object
    return loc(*self.__args, **self.__kwargs)
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/celery/app/base.py", line 454, in _task_from_fun
    task.bind(self)  # connects task to this app
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/celery/app/task.py", line 319, in bind
    setattr(cls, attr_name, conf[config_name])
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/celery/utils/collections.py", line 429, in __getitem__
    return getitem(k)
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/celery/utils/collections.py", line 278, in __getitem__
    return mapping[_key]
  File "/Users/my_mbp/anaconda3/lib/python3.6/collections/__init__.py", line 989, in __getitem__
    if key in self.data:
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/kombu/utils/objects.py", line 44, in __get__
    value = obj.__dict__[self.__name__] = self.__get(obj)
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/celery/app/base.py", line 141, in data
    return self.callback()
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/celery/app/base.py", line 924, in _finalize_pending_conf
    conf = self._conf = self._load_config()
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/celery/app/base.py", line 934, in _load_config
    self.loader.config_from_object(self._config_source)
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/celery/loaders/base.py", line 126, in config_from_object
    obj = self._smart_import(obj, imp=self.import_from_cwd)
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/celery/loaders/base.py", line 147, in _smart_import
    return symbol_by_name(path, imp=imp)
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/kombu/utils/imports.py", line 56, in symbol_by_name
    module = imp(module_name, package=package, **kwargs)
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/celery/loaders/base.py", line 98, in import_from_cwd
    package=package,
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/celery/utils/imports.py", line 104, in import_from_cwd
    return imp(module, package=package)
  File "/Users/my_mbp/anaconda3/lib/python3.6/site-packages/celery/loaders/base.py", line 92, in import_module
    return importlib.import_module(module, package=package)
  File "/Users/my_mbp/anaconda3/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 978, in _gcd_import
  File "<frozen importlib._bootstrap>", line 961, in _find_and_load
  File "<frozen importlib._bootstrap>", line 948, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'celeryconfig'

I can't see where exactly I'm going wrong. As a short explanation for my original aim: I'd like to print out in a new window the information retrieved from various tasks, so like a progress bar but instead of a percentage, the output is like what you'd see in Terminal.
Thanks.

Source