displayLayer

def displayLayerFtn(*args):
    ## get object name space
    object = cmds.ls(sl=1)[0].split(':')[0]
    list=[":Group:",":Set",":Prop",":Vehicle",":Character"]
    for l in list:
        try:
            pm.select(object+l)
        except:
            pass

    if cmds.objExists(object+"_LYR"):
        pm.select(clear=True)
        pm.warning ("Layer is exist")
    else:
        pm.createDisplayLayer(name = object+"_LYR", noRecurse=True)
        layerName = object+"_LYR"
        pm.setAttr(layerName+".visibility",1)
        randomize = rand.uniform(1,31)
        pm.setAttr(layerName+".color",randomize)
        pm.select(clear=True)

displayLayerFtn()