How can I use Arcpy to set label expression parser to Python?

Question

I looked and looked but I can't find anything that lets the user to change the parser default to python for label expressions. The default is vb so when I run my arcpy script it list my python expression in the vb which doesn't work because it's in a different language. Can someone help me? import os import arcpy # if outside ArcMap # inside ArcMap, use "CURRENT" for document name mxd = arcpy.mapping.MapDocument(r"C:\Users\aa2zz6\Desktop est\Untitled.mxd") df = arcpy.mapping.ListDataFrames(mxd, '')[0] for lyr in arcpy.mapping.ListLayers(mxd, "P_Meters"): print lyr.name if lyr.supports("LABELCLASSES"): print lyr.name + " supports label classes" for lblClass in lyr.labelClasses: print lblClass.className lblClass.expression = lblClass.expression = '"{}" + [HOUSENUMBER] + "{}"'.format("","") if lblClass.showClassLabels: print " Class Name: " + lblClass.className print " Expression: " + lblClass.expression lyr.showLabels = True del mxd‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

XanderBakker · Accepted Answer

Although the help (LabelClass—Help | ArcGIS Desktop) mentions this: Provides the ability to get or set a layer's individual label class expression. This can be as simple as a single field or more advanced using either a VBScript, JScript or Python expression. .. I haven't seen a way of setting the parser. However, there isn't really a need to do so. You can simply use this and that will work: import os import arcpy # if outside ArcMap # inside ArcMap, use "CURRENT" for document name mxd = arcpy.mapping.MapDocument(r"C:\GeoNet\LabelClass\myMap.mxd") df = arcpy.mapping.ListDataFrames(mxd, '')[0] for lyr in arcpy.mapping.ListLayers(mxd, "P_Meters"): print lyr.name if lyr.supports("LABELCLASSES"): print lyr.name + " supports label classes" for lblClass in lyr.labelClasses: print lblClass.className lblClass.expression = lblClass.expression = "\"\" & [HOUSENUMBER] & \"\"" if lblClass.showClassLabels: print " Class Name: " + lblClass.className print " Expression: " + lblClass.expression lyr.showLabels = True mxd.save() del mxd‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍