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Using Celery with Flask

This repository contains the example code for my blog article Using Celery with Flask.

The application provides two examples of background tasks using Celery:

  • Example 1 sends emails asynchronously.
  • Example 2 launches one or more asynchronous jobs and shows progress updates in the web page.

Here is a screenshot of this application:

Quick Setup

  1. Clone this repository.
  2. Create a virtualenv and install the requirements.
  3. Open a second terminal window and start a local Redis server (if you are on Linux or Mac, execute run-redis.sh to install and launch a private copy).
  4. Open a third terminal window. Set two environment variables MAIL_USERNAME and MAIL_PASSWORD to a valid Gmail account credentials (these will be used to send test emails). Then start a Celery worker: venv/bin/celery worker -A app.celery --loglevel=info.
  5. Start the Flask application on your original terminal window: venv/bin/python app.py.
  6. Go to http://localhost:5000/ and enjoy this application!

For details on how this all works, see my article Using Celery with Flask.