用arcgis pro 的arcpy，点图层的唯一值 渲染符号后，地图中不显示点符号

import arcpy, os, sys



arcpy.env.overwriteOutput=True

p = arcpy.mp.ArcGISProject(r"D:\测试工作\Pro\MyProject\MyProject.aprx")

m = p.listMaps('Map')[0]

l = m.listLayers('yq_20200116_JSONToFeatures*')[0]

sym = l.symbology



sym.updateRenderer('UniqueValueRenderer')

sym.renderer.fields = ['OBJECTID_1']

for grp in sym.renderer.groups:

    for itm in grp.items:

        transVal = itm.values[0][0] #Grab the first "percent" value in the list of potential values

        itm.symbol.color = {'RGB': [255, 0, 0, int(transVal)]}

        itm.label = str(transVal) + '%'



l.symbology = sym

p.saveACopy(r"D:\测试工作\Pro\MyProject\SavedOutput.aprx")