To view the active application, please go to https://algebraic-ward-158203.appspot.com/
Not Python 3.x or 2.6 or even 1.0.
If you have latest MacOS, you should have Python 2.7 up and running. Otherwise, please refer to https://www.python.org/downloads/release/python-2712/ for your particular (apparently obsolete) machine to be installed. If you are not sure, type python -V in your terminal or console to find out.
Follow the instructions given in this link: https://cloud.google.com/sdk/docs/
Go to the level where you can see the app.yaml, and type dev_appserver.py app.yaml then run over to your favorite browser, presumely the Chrome browser, and type localhost:8080 to view the local app.