Curve growing thing wrk

#Get closest point on crv
# find  parent stroke end clip position/value

from pymel.core import *
import maya.api.OpenMaya as om
import random as r
class OnCrvObj:
    def __init__(self):
        self.CrvObj = self
        self.CrvPos = self.getTransform()
def MakeMoPath(CrvObj):
    cpCheck = ls("CrvPointMoPath")
    if cpCheck:
        delete(cpCheck)
    cp = createNode("motionPath",n="CrvPointMoPath")
    setAttr(cp+".fractionMode", 1)
    CrvObj.worldSpace >> cp.geometryPath
    lCheck = ls("ClosestPoint_lctr")
    if lCheck:
        delete(lCheck)
    l = spaceLocator(n = "ClosestPoint_lctr")
    cp.allCoordinates >> l.translate
    #target.getShape().worldMatrix[0] >> cp.inputMatrix
    #target.getShape().worldMesh[0] >> cp.inMesh
    return cp, l
def getDist(p1,p2):
    dist = defAttr.srt((p1[0] - p2[0])**2 + (p1[1] - p2[1])**2 + (p1[2] - p2[2])**2)
    return dist

sampleAmnt = 100
xInc = 0.01

#sl = selected()
objects = sl[:-1]
Crv = sl[-1]

moPathNode, lctr = MakeMoPath(Crv)
x = 0
bestPos = 10000
bestLoc = 0
xSave = 0
for i in range(0,sampleAmnt):
    if x < 1:
        setAttr(moPathNode+".uValue", x)
    LctrPos = lctr.getTranslation()
    PointOnPathPos = objects[0].getTranslation()
    dist = getDist(LctrPos,PointOnPathPos)
    if dist < bestPos:
        bestPos =  dist
        bestLoc = LctrPos
        xSave = x
    x += xInc
#EndPos = spaceLocator(n = "Lctr_"+str(xSave))
#move(EndPos, bestLoc)

CrvObjectStroke = listConnections(objects[0].worldSpace[0])
CrvCrvStroke = listConnections(Crv.worldSpace[0])[1]
GrowStuff = [CrvCrvStroke, CrvObjectStroke[0], str(xSave), str(0.05)]

GrowExpression = "if("+GrowStuff[0]+".maxClip>="+GrowStuff[2]+"){if("+GrowStuff[0]+".maxClip<1){"+GrowStuff[1]+".maxClip="+GrowStuff[0]+".maxClip-"+GrowStuff[2]+";}else{if("+GrowStuff[1]+".maxClip < 1)"+GrowStuff[1]+".maxClip += "+GrowStuff[3]+" ;}}else{"+GrowStuff[1]+".maxClip = 0 ;}"
#ex = expression(CrvObjectStroke[0], uc="all",  td=1, s = GrowExpression, ae=1, n = CrvObjectStroke[0]+"_exp",an=1 )
ex = expression(CrvObjectStroke[0], s = GrowExpression, n = CrvObjectStroke[0]+"_exp")
expression(ex, e=1,s=GrowExpression,ae=1, uc="all")
delete(moPathNode,lctr)