Personal Migration Guide for Google App Engine from python 2.5 to 2.7

app.yaml    Select all

#change application name to new id that enable HRD #application: myapp application: myapp-hrd #change runtime #runtime: python runtime: python27 #add threadsafe threadsafe: true #change remote_api handlers: #- url: /remote_api # script: $PYTHON_LIB/google/appengine/ext/remote_api/handler.py # login: admin - url: /remoteapi.* script: google.appengine.ext.remote_api.handler.app login: admin #change url for app - url: .* script: myapp.app # script: myapp.py #add libraries libraries: - name: webapp2 version: "2.5.2" - name: jinja2 version: "2.6" #add services inbound_services: - warmup

myapp.py    Select all

#import webapp2 and jinja2 import webapp2 import jinja2 #import wsgiref.handlers #from google.appengine.ext import webapp #from google.appengine.ext.webapp import RequestHandler #from google.appengine.ext.webapp import template #from google.appengine.ext.webapp.util import run_wsgi_app #use ndb instead of db #from google.appengine.ext import db #class Greeting(db.Model): # author = db.UserProperty() # content = db.StringProperty(indexed=False) # role = db.StringProperty(required=True, choices=set(["executive", "manager", "helper"])) # date = db.DateTimeProperty(auto_now_add=True) from google.appengine.ext import ndb class Greeting(ndb.Model): """Models an individual Guestbook entry with author, content, and date.""" author = ndb.UserProperty() content = ndb.StringProperty(indexed=False) role = ndb.StringProperty(required=True, choices=set(["executive", "manager", "helper"])) date = ndb.DateTimeProperty(auto_now_add=True) #use TEMPLATE_DIR and JINJA_ENVIRONMENT TEMPLATE_DIR = 'templates' JINJA_ENVIRONMENT = jinja2.Environment( loader=jinja2.FileSystemLoader(os.path.join(os.path.dirname(__file__), TEMPLATE_DIR)), # loader=jinja2.FileSystemLoader(os.path.dirname(__file__)), extensions=['jinja2.ext.autoescape']) #use jinja2 template # path = os.path.abspath(os.path.join(os.path.dirname(__file__), TEMPLATE_DIR, fileName)) # self.response.out.write(template.render(path, values)) template = JINJA_ENVIRONMENT.get_template(fileName) self.response.write(template.render(values)) #use webapp2 instead of webapp #def main(): #application = webapp.WSGIApplication( app = webapp2.WSGIApplication( [('/', MainHandler) # %3D does not work now # ,(r'/id%3D([A-Za-z0-9-.]*)', IDHandler) ,(r'/id=([A-Za-z0-9-.]*)', IDHandler) ], debug=True) # run_wsgi_app(application) #if __name__ == '__main__': # main()

Then, Duplicate Application Settings to a new application id say myapp-hrd

Finally, Migrate the app to the High Replication Datastore (HRD) in Google App Engine admin before uploading the python 2.7 code to the newly converted application id myapp-hrd

At the end of the migration process, the new HRD app (myapp-hrd) will be aliased to the old appid.