code: def GetConfiguredUsers(self):
      
      if os.path.exists(self.google_users_file):
        users = open(self.google_users_file).readlines()
      else:
        users = []
      return [user.strip() for user in users]
docs: Retrieve the list of configured Google user accounts.
  
      Returns:
        list, the username strings of users congfigured by Google.