code: def delete_password(self, service, username):
          
          items = self._find_passwords(service, username, deleting=True)
          if not items:
              raise PasswordDeleteError("Password not found")
          for current in items:
              result = GnomeKeyring.item_delete_sync(current.keyring,
                                                     current.item_id)
              if result == GnomeKeyring.Result.CANCELLED:
                  raise PasswordDeleteError("Cancelled by user")
              elif result != GnomeKeyring.Result.OK:
                  raise PasswordDeleteError(result.value_name)
docs: Delete the password for the username of the service.