Create virtual env and install pip packages

C:\Developer\celery-4-windows>virtualenv celery-windows
C:\Developer\celery-4-windows>activate celery-windows
(celery-windows) C:\Developer>pip install -r requirements.txt

Start Celery worker

Use any of the 3 commands to start the worker, explicitly not using the default prefork pool:

(celery-windows) C:\Developer\celery-4-windows>celery worker --app=app.app --pool=eventlet --loglevel=INFO
(celery-windows) C:\Developer\celery-4-windows>celery worker --app=app.app --pool=gevent --loglevel=INFO
(celery-windows) C:\Developer\celery-4-windows>celery worker --app=app.app --pool=solo --loglevel=INFO

Execute Celery task asynchronously

In a new command prompt window:

C:\Developer>activate celery-windows
(celery-windows) C:\Developer\celery-4-windows>python app.py