old_contents: 
  import webapp2
  import jinja2
  import requests
  import os
  import sys
  import time
  import logging
  import urllib2
  import json
  import re
  from operator import itemgetter
  from datetime import datetime
  from google.appengine.ext import db
  from webapp2_extras import sessions
  from google.appengine.api import mail
  
  #demo change1
  #demo change2
  
  template_dir = os.path.join(os.path.dirname(__file__), 'templates')
  jinja_env = jinja2.Environment(loader = jinja2.FileSystemLoader(template_dir),
                                 autoescape = True)
  
  
  
  def render_str(template, **params):
      t = jinja_env.get_template(template)
      return t.render(params)
  
  
  class BaseHandler(webapp2.RequestHandler):
      def dispatch(self):
          # Get a session store for this request.
          self.session_store = sessions.get_store(request=self.request)
   
          try:
              # Dispatch the request!
              webapp2.RequestHandler.dispatch(self)
          finally:
              # Save all sessions.
              self.session_store.save_sessions(self.response)
  
   
      @webapp2.cached_property
      def session(self):
          # Returns a session using the default cookie key.
          return self.session_store.get_session()
  
      def render(self, template, **kw):
          self.response.out.write(render_str(template, **kw))
  
  
  class ToNotify(db.Model):
      email = db.StringProperty()
  
  
  
  class Main(BaseHandler):
      def get(self):
          self.render('index.html')
      def post(self):
          email = self.request.get('email')
          if email:
              instance = ToNotify(key_name=email,email=email)
              instance.put()
              self.render('thankyou.html')
          else:
              self.render('index.html')
  
  
  
  
  
  
  config = {}
  config['webapp2_extras.sessions'] = {'secret_key': ' ','cookie_args':{'max_age':86400}}
  
  
  app = webapp2.WSGIApplication([
      ('/',Main)
  ],config=config, debug=True)
  
new_contents: 
  import webapp2
  import jinja2
  import requests
  import os
  import sys
  import time
  import logging
  import urllib2
  import json
  import re
  from operator import itemgetter
  from datetime import datetime
  from google.appengine.ext import db
  from webapp2_extras import sessions
  from google.appengine.api import mail
  
  #demo change1
  #demo change2
  template_dir = os.path.join(os.path.dirname(__file__), 'templates')
  jinja_env = jinja2.Environment(loader = jinja2.FileSystemLoader(template_dir),
                                 autoescape = True)
  
  
  
  def render_str(template, **params):
      t = jinja_env.get_template(template)
      return t.render(params)
  
  
  class BaseHandler(webapp2.RequestHandler):
      def dispatch(self):
          # Get a session store for this request.
          self.session_store = sessions.get_store(request=self.request)
   
          try:
              # Dispatch the request!
              webapp2.RequestHandler.dispatch(self)
          finally:
              # Save all sessions.
              self.session_store.save_sessions(self.response)
  
   
      @webapp2.cached_property
      def session(self):
          # Returns a session using the default cookie key.
          return self.session_store.get_session()
  
      def render(self, template, **kw):
          self.response.out.write(render_str(template, **kw))
  
  
  class ToNotify(db.Model):
      email = db.StringProperty()
  
  
  
  class Main(BaseHandler):
      def get(self):
          self.render('index.html')
      def post(self):
          email = self.request.get('email')
          if email:
              instance = ToNotify(key_name=email,email=email)
              instance.put()
              self.render('thankyou.html')
          else:
              self.render('index.html')
  
  
  
  
  
  
  config = {}
  config['webapp2_extras.sessions'] = {'secret_key': ' ','cookie_args':{'max_age':86400}}
  
  
  app = webapp2.WSGIApplication([
      ('/',Main)
  ],config=config, debug=True)
  
subject: Revert "1"