code: def _determine_interop_ns(self):
          
          test_classname = 'CIM_Namespace'
          interop_ns = None
          for ns in self.INTEROP_NAMESPACES:
              try:
                  inst_paths = self._conn.EnumerateInstanceNames(test_classname,
                                                                 namespace=ns)
              except CIMError as exc:
                  if exc.status_code == CIM_ERR_INVALID_NAMESPACE:
                      # Current namespace does not exist.
                      continue
                  elif exc.status_code in (CIM_ERR_INVALID_CLASS,
                                           CIM_ERR_NOT_FOUND):
                      # Class is not implemented, but current namespace exists.
                      interop_ns = ns
                      break
                  else:
                      # Some other error happened.
                      raise
              else:
                  # Namespace class is implemented in the current namespace.
                  # Use the returned namespace name, if possible.
                  ns_names = [p.keybindings['name'] for p in inst_paths]
                  ns_dict = NocaseDict(list(zip(ns_names, ns_names)))
                  try:
                      interop_ns = ns_dict[ns]
                  except KeyError:
                      interop_ns = ns
                  break
          if interop_ns is None:
              # Exhausted the possible namespaces
              raise CIMError(
                  CIM_ERR_NOT_FOUND,
                  _format("Interop namespace could not be determined "
                          "(tried {0!A})", self.INTEROP_NAMESPACES),
                  conn_id=self.conn.conn_id)
          self._interop_ns = interop_ns
docs: Determine the name of the Interop namespace of the WBEM server, by
          trying to communicate with it on a number of possible Interop
          namespace names, that are defined in the :attr:`INTEROP_NAMESPACES`
          class variable.
  
          If the Interop namespace could be determined, this method sets the
          :attr:`interop_ns` property of this object to that namespace and
          returns.
          Otherwise, it raises an exception.
  
          Raises:
  
              Exceptions raised by :class:`~pywbem.WBEMConnection`.
              CIMError: CIM_ERR_NOT_FOUND, Interop namespace could not be
                determined.