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e.g. "templates" or "datastore"

# Overview

App Engine applications can authenticate users using Google Accounts. An application can redirect a user to a Google Accounts page to sign in or register for an account, or sign out. While a user is signed in to an application using a Google account, the application can access the user's email address and nickname. The application can also detect if the user is an administrator for the application, making it easy to implement admin-only areas of the application.

    from google.appengine.api import users

    class MyHandler(webapp.RequestHandler):
      def get(self):
        user = users.get_current_user()
        if user:
          greeting = ("Welcome, %s! (<a href=\"%s\">sign out</a>)" %
                      (user.nickname(), users.create_logout_url("/")))
        else:
          greeting = ("<a href=\"%s\">Sign in or register</a>." %
                      users.create_login_url("/"))

        self.response.out.write("<html><body>%s</body></html>" % greeting)