scripJob - scriptNode: create a expression, add an attr to object, change color via fun in expression

changeColorAttr.py

myCode = '''
from maya import cmds

def test():
	print 'ok'
	sel = cmds.ls(sl=True)
	obj_attr = '%s.color' % sel[0]
	colorNum = cmds.getAttr( obj_attr )
	if cmds.getAttr(obj_attr) == 0 :
		cmds.polyColorPerVertex(r=0.0,g=1.0,b=0.0,a=1,cdo=True) 
		print '%s bang 0' % obj_attr		
	elif cmds.getAttr(obj_attr) == 1 :
		cmds.polyColorPerVertex(r=0.0,g=0.0,b=1.0,a=1,cdo=True) 		
		print '%s bang 1' % obj_attr			
	elif cmds.getAttr(obj_attr) == 2 :
		cmds.polyColorPerVertex(r=1.0,g=0.0,b=1.0,a=1,cdo=True) 		
		print '%s bang 2' % obj_attr				
	
		
cmds.scriptJob ( attributeChange = ['pCube1.color', test])
'''
cmds.scriptNode( st=2, bs=myCode.replace("'''","''" ), n='sn_colorChange', stp='python')