What is the best option for a (Python 3) task queue on Windows now that Celery 4 has dropped Windows support?

I run Flask with Huey on Windows without any issues, admittedly only for development and testing. For production I use Flask/Huey on Linux servers. Both with the Redis back-end, Flask 0.12 and Huey 1.2.0 .

I use the factory pattern to create a specialised "cut down" version of a Flask app for specific use by Huey tasks. This version doesn't load blueprints or configure Flask-Admin as these aren't required in the Huey tasks.

Example code of __init__.py in app folder. App is a class extending from Flask:

def create_app(settings_override=None):    app = App('app')    if settings_override:        app.config.from_object(settings_override)    else:        app.config.from_object(os.environ['APP_SETTINGS'])    from .ext import configure_extensions    configure_extensions(app, admin, load_modules=True)    # REST    import rest.api_v1    app.register_blueprint(api_v1_bp, url_prefix='/api/v1')    #  ... and more suffdef create_huey_app():    app = App('huey app')    app.config.from_object(os.environ['APP_SETTINGS'])    from .ext import configure_extensions    configure_extensions(app, admin=None, load_modules=False)    return app

The idea of configure_extensions is taken from Quokka CMS. Examine its app __init__.py and its extensions module to see how this is implemented. Note also how this project too creates a specific app (create_celery_app) for use with the Celery task queue.

Example of tasks.py. Note the use of with app.app_context(): to create the Flask context. Now my functions have access to the extensions such as Flask-Mail, Flask-SqlAlchemy (db, models) etc.

@huey.task()def generate_transaction_documents_and_email(transaction_id):    app = create_huey_app()    with app.app_context():        reports.generate_transaction_documents_and_email(transaction_id)@huey.task()def send_email(subject, recipients, text_body, html_body, attachments=[], cc=[]):    app = create_huey_app()    with app.app_context():        emails.send_email(subject, recipients, text_body, html_body, attachments, cc)@huey.periodic_task(crontab(minute='30'))def synchronize_mailing_list():    app = create_huey_app()    if app.config['CREATESEND_SYNCHRONIZE']:        _list_name = app.config['CREATESEND_LIST']        with app.app_context():            sync_delete_ar_subscribers(_list_name)            sync_add_ar_subscribers(_list_name)