Celery discovers all tasks even when `app.autodisc

I am using Django==2.0.5 and celery==4.0.2. My proj/proj/celery.py looks like:

from __future__ import absolute_import, unicode_literals
import os
from celery import Celery

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

app = Celery('proj', include=[])

# Using a string here means the worker doesn't have to serialize
# the configuration object to child processes.
# - namespace='CELERY' means all celery-related configuration keys
#   should have a `CELERY_` prefix.
app.config_from_object('django.conf:settings', namespace='CELERY')

# Load task modules from all registered Django app configs.
# app.autodiscover_tasks()


@app.task(bind=True)
def debug_task(self):
    print('Request: {0!r}'.format(self.request))

I was expecting that none of the tasks decorated with shared_task in tasks.py of the apps will be discovered but to my surprise, most of the tasks can be seen under [tasks] when running celery worker with celery worker -A proj -l INFO.

My directory structure is somewhat like:

app
│   ├── __init__.py
│   ├── admin.py
│   ├── apps.py
│   ├── constants.py
│   ├── scripts
│   │   ├── __init__.py
│   ├── factories.py
│   ├── migrations
│   │   ├── 0001_initial.py
│   │   ├── __init__.py
│   ├── models.py
│   ├── tasks.py
│   └── tests
│       ├── __init__.py

CELERY_IMPORTS is not set in settings.py and I have even tried with CELERY_IMPORTS=() and CELERY_IMPORTS=['path/to/one/of/the/modules'], even then all the tasks get discovered.

Any suggestion is welcome.

You should try @app.task without the (bind=True) flag. Also celery can detect all the tasks inside a module if they are in the init file of the module. In the django settings.py