Question about Exposing the Unique Renderer Symbology Count Values

David_Lindsey

Hello everyone,

Does anyone know if Esri has exposed the Count values within Python's ArcPy for the unique value renderer items? The current documentation indicates that the Item's description, label, symbol, and values are exposed via Python. However, ArcGIS Pro allows you to also display the number of occurrences per item by toggling the Count field (i.e. Show Count) within the Symbology pane:

Unfortunately, I am unable to find this option within Python thus far.

For our workflow, we do not "refresh" our unique value symbology each time a change is made. Pre-existing symbology needs to remain static. Because of that, we opt to add missing values (with .listMissingValues()). Afterwards, we manually go into ArcGIS Pro and check/remove any out-dated unique values that show a Count of 0:

I'd like to automate this process where the script removes any unique values with a Count of 0, but that doesn't appear to be possible based on the documentation I've found thus far. I may be looking in the wrong place though.

Does anybody have any insight into this, or if it's even possible via Python? Thanks!

Anonymous User

You 'could' maybe do a length on the itm.values to get a count.

 

len(itm.values)

 

Or you could maybe go about it a different way and run your own summary/ cnt type cursor on the dataset, using the same field that the renderer is using into a dictionary.  Then iterate over the sym,renderer.groups and if the value is not in the dictionary you created earlier, remove it.

!!!!!!!!!

EDIT:  The len() method doesn't work.. The list of values in the items is the value from any field that is used for the renderer so if you only have one field, there will be one value.  bummer!

At this point, I'd use a cursor to determine counts and then recursively remove the items from the renderer that do have a match.