topic Re: ArcGIS Pro 1.41 Python script - what am I missing?? in Python Questions

ArcGIS Pro 1.41 Python script - what am I missing??

RyanMcCluskey1 — Fri, 17 Feb 2017 20:51:00 GMT

I recently switched from Desktop to Pro and totally at a loss of figuring out how to make this very simple script work in ArcPro. Note that it runs and says success but the symbology does not change.

import arcpy

in_fc = arcpy.GetParameterAsText(0)
in_lyrx = arcpy.GetParameterAsText(1)

arcpy.management.ApplySymbologyFromLayer(in_fc,in_lyrx)

Re: ArcGIS Pro 1.41 Python script - what am I missing??

DanPatterson_Retired — Fri, 17 Feb 2017 20:58:25 GMT

There is currently no direct connection between your script and the map itself. If you want to see updates onscreen, you should examine the arcpy.ma module. If there script is being run in the correct location with an open project using 'Current' as the project, then the map will be automatically refreshed in the newest version of PRO

Re: ArcGIS Pro 1.41 Python script - what am I missing??

RyanMcCluskey1 — Fri, 17 Feb 2017 21:21:44 GMT

Dan. I took a look at the arcpy.mp help (I think you meant mp, not ma?) and added a map parameter but I'm still missing something. The script below runs but again I don't see the symbology update. Thanks for the help!

Re: ArcGIS Pro 1.41 Python script - what am I missing??

DanPatterson_Retired — Fri, 17 Feb 2017 21:29:49 GMT

ApplySymbologyFromLayer help topic suggests it should work... with the usual warnings and exclusions you may need to print the in_fc since it should be a layer in the project. They sadly, only give code samples for *.lyr files so I am not sure whether they mean 'layers' or 'layer' if you catch my drift and different emphasis on the term 'layer'

Re: ArcGIS Pro 1.41 Python script - what am I missing??

RyanMcCluskey1 — Fri, 17 Feb 2017 21:33:02 GMT

Thanks Dan. Yea, I catch your drift on layer/layers. I'll keep searching for a solution and post when I figure it out. For the time it is a bit maddening.

Re: ArcGIS Pro 1.41 Python script - what am I missing??

JoshuaBixby — Fri, 17 Feb 2017 22:47:50 GMT

In your code, you are looping through the layers in a map, but you aren't doing anything to any of the layers when you loop through them. After you loop through them, you apply symbology to in_fc. What is in_fc, exactly? The variable naming makes me think it is a feature class and not a layer.

Re: ArcGIS Pro 1.41 Python script - what am I missing??

RyanMcCluskey1 — Fri, 17 Feb 2017 23:10:05 GMT

Joshua. The name I use "in_fc" indicates I'm picking a feature class but the data type in the tool is "Layer" (I also tried "Feature Layer") and I'm picking one of the layers in the map. I just loop through the layers to check that I have the right map and a layer is found matching the "in_fc" parameter.

Thanks for the suggestion.

Re: ArcGIS Pro 1.41 Python script - what am I missing??

JoshuaBixby — Sat, 18 Feb 2017 00:45:21 GMT

If you hard-wire the parameter values and run the code from the interactive Python window, does it work for you?

Re: ArcGIS Pro 1.41 Python script - what am I missing??

DarrenWiens2 — Sat, 11 Dec 2021 14:28:44 GMT

I'm not quite sure how this differs from your original script, but this works for me:

my_lyr = 'qs' # the feature layer name
lyr_file = r'C:\junk\mylyr.lyrx' # the symbology layer file
arcpy.ApplySymbologyFromLayer_management(my_lyr,lyr_file) # apply symbology‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: ArcGIS Pro 1.41 Python script - what am I missing??

JoshuaBixby — Tue, 21 Feb 2017 15:40:44 GMT

dkwiens‌, are you running your code from the interactive Python window/console or a script tool? I think the OP is wanting to run it from a script tool and that is where the issue is arising.

Re: ArcGIS Pro 1.41 Python script - what am I missing??

RyanMcCluskey1 — Tue, 21 Feb 2017 17:37:40 GMT

Darren / Joshua,

Interesting test you suggested so I simplified the script and it still runs "successfully" as a script but the symbology doesn't change. When I run ApplySymbology from the python window with the exact same parameters, it runs successfully AND the symbology does change. So, It's a problem with running it from a Script but I still don't know why.

SCRIPT

After Script is Run (no change in symbology)

After Same Parameters are used in ApplySymbology function run from Python Window

Re: ArcGIS Pro 1.41 Python script - what am I missing??

DanPatterson_Retired — Tue, 21 Feb 2017 17:46:31 GMT

on a lark... in the map that symbology didn't change... did you toggle it on and off?

Re: ArcGIS Pro 1.41 Python script - what am I missing??

RyanMcCluskey1 — Tue, 21 Feb 2017 17:51:07 GMT

Yea. I just re-ran it, toggled it, closed the map and reopened and no change in the symbology. Was worth checking but no dice.

Re: ArcGIS Pro 1.41 Python script - what am I missing??

JoshuaBixby — Tue, 21 Feb 2017 18:31:03 GMT

The answer to your question may be buried in the Setting output symbology in scripts documentation. I haven't had time to read it and fully digest that page yet.

Re: ArcGIS Pro 1.41 Python script - what am I missing??

ThomasLynch — Mon, 31 Jul 2017 19:15:59 GMT

I'm encountering exactly the same problem. At an absolute loss just like yourself. The apply symbology geoprocessing tool works fine but I can't get this function working in python at all.

Re: ArcGIS Pro 1.41 Python script - what am I missing??

JustinReynolds — Sat, 11 Dec 2021 14:28:46 GMT

My experience with arcpy.ApplySymbologyFromLayer_management was that the script would complete with no error. The layer would lock itself out in TOC while the script was running as if the symbology was being set, but when the arcpy.ApplySymbologyFromLayer_management completed the layer's symbols, labeling, popup, etc. didn't actual update.

For anyone still struggling with this, "Refreshing" the layer's connection properties after applying the layer file did the trick. I think it is a bug (I was hopeful 2.1 would fix it), but non the less the following worked for me.

# Tested with ArcPro 2.0+
# ApplySymbologyFromLayer_management Bug Work Around

import arcpy

# Set the workspace if desired
# arcpy.env.workspace = 'C:\data'

# Set layer to apply symbology to
inputLayer = "FDT_02171592"  # in the current workspace

# Set layer that output symbology will be based on
symbologyLayer = 'N:\ArcGIS - Materials\Project Template\Layer Files\FDT_v1_5.lyrx'

# Symbolize the input by Test_Status field
symbologyFields = [["VALUE_FIELD", "Test_Status", "Test_Status"]]

# Apply the symbology from the symbology layer to the input layer
arcpy.ApplySymbologyFromLayer_management(inputLayer, symbologyLayer, symbologyFields)

# It would appear that the layer properties (sym, labeling, etc.) are not being applied from the layer file
# when in fact they are.  The bug seems to revolve around the layer display cache.  Apply sym from layer via arcpy, no
# change appears, but if you then go into the layer's properties and clear the cache and change the cache setting
# to do not cache the sym from the layer file all of the sudden appear.  Many of the layer properties are not exposed
# via arcpy, however, we can "artificially" update the layer's connection properties by setting the new connection
# info equal to the current connection info. By doing this we are essentially "refreshing" the connection.  This
# produces the desired effect with applySymbologyFromLayer through arcpy.

aprx = arcpy.mp.ArcGISProject("CURRENT")  # Reference the open project
myMap = aprx.listMaps()[0]  # Get the map that contains the input layer
myLayers = myMap.listLayers()  # either get the input layer and refresh or get a list of layers and iterate and refresh

for layer in myLayers:
    if layer.name == inputLayer:
        # "Refresh" the layer connection properties by setting the new connection = current connection
        layer.updateConnectionProperties(inputLayer, inputLayer)

Re: ArcGIS Pro 1.41 Python script - what am I missing??

JustinReynolds — Thu, 18 Jan 2018 22:43:44 GMT

Thomas see my reply to this question I posted today. I hope it helps.