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Rename a list of objects using the selection list’s object names in the rename, add a suffix or prefix.

import maya.cmds as cmds

selectionList = cmds.ls( selection=True ) #create a list of object from your current selection

for selectionListObjects in selectionList:

null=cmds.group(empty=True)
nullName = cmds.rename(null, selectionListObjects + ‘Null’)
print newName
cmds.parent(selectionListObjects,nullName)