I more or less inadvertently have two files in the mysite directory - one named flask_app.py and other oldflask_app.py and I'm wondering how it's determined which runs on a request for username.pythonanywhere.com? They both have @app.route('/'... in them.
I can test it and see that it runs flask_app.py, but I was wondering how it chooses and can't find any configuration file that tells it what to look for.