Change the username of one or more Google Apps users in your domain

rename_google_apps.py

import gdata.apps.service

service = gdata.apps.service.AppsService(email="admin@mydomain", domain="mydomain.com", password="password")
service.ProgrammaticLogin()

names = {'from':'to'}

for current, change_to  in names.iteritems():

  user_entry = service.RetrieveUser(current)
  user_entry.login.user_name = change_to

  service.UpdateUser(current, user_entry)

  print user_entry