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


class MainHandler(webapp.RequestHandler):

    def get(self):
        self.response.out.write('Hello world!')

def main():
    application = webapp.WSGIApplication([('/', MainHandler)], debug=True)
util.run_wsgi_app(application)
if __name__ == '__main__':
    main()
Appengine GET parameters