code: def set_user_attribute(self, username, attribute, value, raise_on_error=False):
          
          data = {
              'attributes': [
                  {
                      'name': attribute,
                      'values': [
                          value
                      ]
                  },
              ]
          }
          response = self._post(self.rest_url + "/user/attribute",
                                params={"username": username,},
                                data=json.dumps(data))
  
          if response.status_code == 204:
              return True
  
          if raise_on_error:
              raise RuntimeError(response.json()['message'])
  
          return False
docs: Set an attribute on  a user
          :param username: The username on which to set the attribute
          :param attribute: The name of the attribute to set
          :param value: The value of the attribute to set
          :return: True on success, False on failure.