A minimal app using the Flask framework
To set up this repository on a local machine, I would recommend running the following commands:
$ python3 -m venv venv
$ source venv/bin/activate
$ pip3 install -r requirements.txt
This will create a new Python virtualenv and download Flask. Virtualenvs are directories that hold all of the dependencies for a specific Python project. It is considered good practice to create a new virtualenv at the root of a directory when starting a new Python project.
To run this application locally, you can run the app.py script like you would run any other Python application:
python3 app.py
This will start a server process at http://localhost:5000 which you can use to preview your application. On Cloud Shell, you can click the "Preview" button in the top right of the page.
Each time this command is run, it will publish a new version of your application to App Engine. The first time that you run this it will ask you to specify a project and location if you have not run it before.
$ gcloud app deploy app.yaml