Heroku is an implementation of the platform-as-a-service (PaaS) concept that can be used to more easily deploy Python applications.
Migrating your Django Project to Heroku is a full tutorial on using Heroku to run Django web applications. It includes instructions on converting from MySQL to PostgreSQL if necessary as well as how to properly handle your settings files.
How to deploy Django project to Heroku using Docker explains that although Buildpacks are the most common way to deploy to Heroku, packaing your app in a Docker container is also a viable approach. It walks through the steps needed to deploy a Django app in the remainder of the article.
Heroku's official Python documentation is fantastic and walks through deploying WSGI applications in short order.
Production Django Deployments on Heroku aims to simplify the process of deploying, maintaining, and scaling production-grade Django apps on Heroku.
Deploying Django to Heroku With Docker looks at how to deploy a Django app to Heroku with Docker via the Heroku Container Runtime.
Heroku Chatbot with Celery, WebSockets, and Redis is a walkthrough with available source code to build a Django and Redis-based chat bot that can be easily deployed to Heroku.