Question

3 days ago I started using google appengine to see how it works.

I have set the basic app that prints “hello”. Nothing complicated. I updated the simple app thet prints “hello” app and it worked perfectly.

Then I wanted to experiment a little more:

First I did is that I uploaded new program (i didint change app.yaml, just main.py)
Then i got a empty screen.

Then I uploaded a new version of app (changed version in app.yaml, and main.py), I have changed a versions in admin in backend. I still had a empty screen.

Thanks.

This is my code:
main.py

#!/usr/bin/env python
print 'Hello, World!'

app.yaml:

application: searchbarrel
version: 2
runtime: python
api_version: 1

handlers:
- url: /.*
  script: main.py

The app works good on localhost

Answer 1

this can’t work. its not enough to write a file that has a print hello inside. you need to create a WSGI app and make a RequestHandler that processes your request and writes the hello world out.

main.py

import webapp
from google.appengine.ext.webapp.util import run_wsgi_app

class MainPage(webapp.RequestHandler):
    def get(self):
        self.response.out.write('Hello, World')

app = webapp2.WSGIApplication([('/', MainPage)])

def main():
    application = webapp.WSGIApplication([("/", MainPage)], debug=True)
    run_wsgi_app(application)

if __name__ == "__main__":
    main()

you should read the getting started guide first.
https://cloud.google.com/appengine/docs/standard/python/