Segmentation visibility by code

Support
,
3

hi
this works to hide all segmentation:

disp=slicer.util.getNode('Segmentation')
disp.SetDisplayVisibility(False)

but I can’t make it show only Left-Cerebral-Cortex .
try this:

slicer.vtkMRMLSegmentationDisplayNode('Segmentation').SetAllSegmentsVisibility(False)

but I have the following error:

ValueError: could not extract hexadecimal address from argument string