copy/attach to crv

# copy/attach to crv
from pymel.core import *
import random as r
def grpr(name):
    g = ls(name)
    if not g:
        g = group(n=name,em=1)
    else:
        g = g[0]
    return g
sl = selected()
objGrp = ls("crvPopGrp")[0].listRelatives(c=1)
spreadRange = [0.2,0.8]
objDensity = 20
mGrp = grpr("toCrv_master_grp")
for s in sl:
    cl = arclen(s)
    objDenistyAmnt = int(cl * objDensity)
    for i in range(0,objDenistyAmnt):
        ro = r.randint(0,len(objGrp)-1)
        d = duplicate(objGrp[ro])
        oGrp = grpr(s+"toCrv_obj_grp_"+str(i))
        parent(d,oGrp)
        parent(oGrp,mGrp)
        rY = r.randint(0,360)
        rX = r.randint(0,360)
        rZ = r.randint(0,360)
        rotate(d,rX,rY,rZ)

        rS = r.uniform(.5,1.8)
        scale(d,rS,rS,rS)
        #rt = r.uniform(spreadRange[0],spreadRange[1])
        rt = r.uniform(0,1)
        attachToCrv = pathAnimation(oGrp,fm=1, su = rt, c = s)
        disconnectAttr(attachToCrv+"_uValue.output",attachToCrv+".uValue")
        setAttr(attachToCrv+".uValue", rt)
        #delete(attachToCrv)