NUKE. Set "Rifman" to source filter

rotoFilterCorrector.py

def rotoFilterCorrector():
    RIFMAN = 4  
    MITCHELL = 5
    ROTOS = ["Roto", "RotoPaint"]
    for node in nuke.selectedNodes():
        if node.Class() in ROTOS:
            curveKnob = node['curves']
            root = curveKnob.rootLayer
            for shape in root:
                attrs = shape.getAttributes()
                #help(attrs)
                attrs.set('sf', RIFMAN)
                attrs.set('str', 0)  
            curveKnob.changed()


nuke.menu('Nuke').addCommand("Edit/RotoFilterCorrector", "rotoFilterCorrector()", 'v')

#nuke.addUpdateUI(rotoFilterCorrector)