Recently found that Maya has nice mechanism with UUID attribute on each node in the scene. I don`t know when did they add it but it`s pretty cool! Check this command which finds a lambert shader node based on its unique ID:
import maya.cmds as mc
objUUID = 'E3FABA33-4254-E1F8-6AEF-2FA0A90EBAF7'import maya.cmds as mc
mc.ls(objUUID)[0]
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