gistfile1.py

def require_login(func):
  def require_login_wrapper(self):
    self.user = users.get_current_user()
    if self.user is None:
      self.redirect(users.create_login_url(self.request.path_info +
                                           '?' + self.request.query_string))
      return
    func(self)
  return require_login_wrapper