Exception("DATABASE_URL environment variable not defined") When running local server

I built a django app on my local machine, and then used this tutorial to deploy it with app platform (https://docs.digitalocean.com/tutorials/app-deploy-django-app/) The deployment was successful.

However, now when I try to run my django app locally to continue development, I’m getting the following error:

…/settings.py", line 95, in <module> raise Exception(“DATABASE_URL environment variable not defined”) Exception: DATABASE_URL environment variable not defined

Current settings in settings.py: DEVELOPMENT_MODE = os.getenv(“DEVELOPMENT_MODE”, “False”) == “True”

DEBUG = os.getenv(“DEBUG”, “False”) == “True”

I am unsure of how to reset my settings.py file so that it points to a local sqlite3 db for development.