code: def enable_mfa_device(self, user_name, serial_number,
                            auth_code_1, auth_code_2):
          
          params = {'UserName' : user_name,
                    'SerialNumber' : serial_number,
                    'AuthenticationCode1' : auth_code_1,
                    'AuthenticationCode2' : auth_code_2}
          return self.get_response('EnableMFADevice', params)
docs: Enables the specified MFA device and associates it with the
          specified user.
  
          :type user_name: string
          :param user_name: The username of the user
          
          :type serial_number: string
          :param seriasl_number: The serial number which uniquely identifies
                                 the MFA device.
  
          :type auth_code_1: string
          :param auth_code_1: An authentication code emitted by the device.
  
          :type auth_code_2: string
          :param auth_code_2: A subsequent authentication code emitted
                              by the device.