Set label font size for layer via Python

Question

I have some ArcMap addin that creates new layer and add it into table of content. I need to set up labels for that layer.

I have made some script for labeling layer:

mxd = arcpy.mapping.MapDocument("CURRENT")
data_frame = mxd.activeDataFrame
layer_divide = arcpy.mapping.ListLayers(mxd, "layer", data_frame)[0]
if layer_divide.supports("LABELCLASSES"):
 for lblclass in layer_divide.labelClasses:
 lblclass.expression = "[OBJECTID]"
 lblclass.showClassLabels = True
layer_divide.showLabels = True
arcpy.RefreshActiveView()

This add labels, but I don't know how to change font size of that labels.

Answer 1

Labels in ArcMap can have formatting codes within the expression, so something like:

lblclass.expression = '"{}" + [OBJECTID] + "{}"'.format("<FNT size = '24'>","</FNT>") 

might work for you. This is adding font tags around your ObjectID into a label expression <FNT size = '24'> + OBJECTID + </FNT>

• david_p: Thank you! That expression worked for font size. What about layer symbology? Don't you know hot to set it?
• Midavalo: Sorry I didn't see you had two questions - please ask this as a separate question.
• david_p: OK, I ask new question here: gis.stackexchange.com/questions/179139/…