if.py

import clr
clr.AddReference('ProtoGeometry')
from Autodesk.DesignScript.Geometry import *
#The inputs to this node will be stored as a list in the IN variables.
dataEnteringNode = IN

test = IN[0]
true_list = IN[1]
false_list = IN[2]

if test:
	result = true_list
else:
	result = false_list

#Assign your output to the OUT variable.
OUT = result