please use this instead:
```
if (type_=='SLICE'):
    match_urn_list=self._delegate_tools.decompose_slice_urns(match)
    result_list = [ self._slice_authority_resource_manager.lookup_slice(certificate, credentials, urn, filter_, options) for urn in match_urn_list ]
    return self._delegate_tools.to_keyed_dict(result_list, "SLICE_URN")
    
    # result_list = []
    # for urn in match_urn_list:
    #     result_list=result_list + self._slice_authority_resource_manager.lookup_slice(certificate, credentials, urn, filter_, options)
```