Cut Curve randomly

 

import maya.cmds as cmds
import random

selCurves = cmds.ls(sl=True)

for crv in selCurves:
    cmds.rebuildCurve(crv, end=1, kr=0);
    randValue = str(random.uniform(0.98, 1));    
    curULoc = crv +'.u['+ randValue +']';
    cmds.detachCurve(curULoc, ch=True, replaceOriginal=True);