code: def _make_it_so(self, command, calls, *args, **kwargs):
          
          observer = kwargs.pop('observer', False)
          args = (self._fields["hash"],) + args
          try:
              for call in calls:
                  self._engine.LOG.debug("%s%s torrent #%s (%s)" % (
                      command[0].upper(), command[1:], self._fields["hash"], call))
                  if call.startswith(':') or call[:2].endswith('.'):
                      namespace = self._engine._rpc
                  else:
                      namespace = self._engine._rpc.d
                  result = getattr(namespace, call.lstrip(':'))(*args)
                  if observer:
                      observer(result)
          except xmlrpc.ERRORS as exc:
              raise error.EngineError("While %s torrent #%s: %s" % (command, self._fields["hash"], exc))
docs: Perform some error-checked XMLRPC calls.