Nuke Smooth a Stroke

gistfile1.py

import random

def smoothStroke(stroke):
    node=nuke.toNode("RotoPaint1")
    curves=node["curves"]
    brush=curves.toElement(stroke)
    for i in range(len(brush)):
     #help(cp)
     #break
     if i>0 and i<len(brush)-1:
      brush[i].removeAllKeys()
      brush[i].setPosition((brush[i-1].getPosition(nuke.frame())+brush[i].getPosition(nuke.frame())+brush[i+1].getPosition(nuke.frame()))/3)
    curves.changed()

smoothStroke("Brush1")