This is a Python web app using the Flask framework and the Azure Database for PostgreSQL relational database service. The Flask app is hosted in a fully managed Azure App Service. This app is designed to be be run locally and then deployed to Azure. For more information on how to use this web app, see the tutorial Deploy a Python (Django or Flask) web app with PostgreSQL in Azure.
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A Django sample application is also available for the article at https://github.com/Azure-Samples/msdocs-django-postgresql-sample-app.