An application can test whether the currently signed-in user is a registered administrator for the application. An administrator is a user who can access the Administration Console for the application. You can use the Administration Console to manage which users have administrator status.
The function users.is_current_user_admin() returns True if the current user is an administrator for the application.
from google.appengine.api import users
user = users.get_current_user()
if user:
print 'Welcome, %s!' % user.nickname()
if users.is_current_user_admin():
print '<a href="/admin/">Go to admin area</a>'
Tip: An easy way to restrict access to a part of your application to administrators is to use the login: admin configuration element for the URL handler. See Configuring an App.