topic Re: Create a List of Layer from Map running into issues where instance has no attributes in ArcGIS Pro Questions

Create a List of Layer from Map running into issues where instance has no attributes

Kayden75 — Wed, 06 Apr 2022 20:29:37 GMT

I grabbed code from JoshuaSharp-Heward here Simple way to export a Layer List for a Web Map to... - Esri Community

and tweaked it a little to output the layer url with the layer name. Unfortunately I keep running into an issue where one of the items has no attribute and it causes the program to fail. I am trying to write in an exception but don't know how. any help would be appreciated. The exact error is "layer" instance has no attribute 'url'

from arcgis.gis import GIS
from arcgis.mapping import WebMap
gis = GIS('pro')# if running this from Notebook for ArcGIS in AGOL/Enterprise, replace this line with gis = GIS('home')
wmItemId = "" #put the id of the webmap in here
wmItem = gis.content.get(wmItemId)
wm = WebMap(wmItem)
print('\033[1m' +"MapName" )
for lyr in wm.layers:
print('\033[0m' + lyr.title + "\n" + lyr.url)

Re: Create a List of Layer from Map running into issues where instance has no attributes

jcarlson — Thu, 07 Apr 2022 03:04:23 GMT

You could do a full-blown try/except, but you really just want to include the URL if it exists. Including a succinct little ternary operator to look for the 'url' key in the dict is very simple:

[f"{lyr['title']} | {lyr['url'] if 'url' in lyr else 'No URL'}" for lyr in wm.layers]

Returns

['Records | https://maps.co.kendall.il.us/server/rest/services/Hosted/Change_Record_View/FeatureServer/0',
 'Parcels | https://maps.co.kendall.il.us/server/rest/services/Hosted/Change_Record_View/FeatureServer/1']

I don't actually have a no-URL layer to test this on, but I assume it would apply to a sketch layer or something?

Re: Create a List of Layer from Map running into issues where instance has no attributes

Kayden75 — Thu, 07 Apr 2022 13:11:43 GMT

Awesome this works great. Thank You! Quick question, how do I add a /n to this? It isn't taking. Do I need to add a print in front of

[f"{lyr['title']} | {lyr['url'] if 'url' in lyr else 'No URL'}" for lyr in wm.layers]

Re: Create a List of Layer from Map running into issues where instance has no attributes

Kayden75 — Thu, 07 Apr 2022 13:11:12 GMT

Unfortunately after testing it, it only works when I do one map at a time.

Re: Create a List of Layer from Map running into issues where instance has no attributes

Kayden75 — Thu, 07 Apr 2022 13:38:20 GMT

I got it to work by adding

try:
print('\033[0m' + lyr.title + "\n" + lyr.url)
except:
print("No Url")

Thank you for your help

Re: Create a List of Layer from Map running into issues where instance has no attributes

jcarlson — Thu, 07 Apr 2022 14:25:43 GMT

Oh, were you looking to do this for more than one map at a time? It wasn't clear in the original post.

Also, is there a reason you need it to be broken by a newline?

Re: Create a List of Layer from Map running into issues where instance has no attributes

Kayden75 — Thu, 07 Apr 2022 19:54:04 GMT

it's a little jank but I use FME to read in every map on an account then have it write out in python script then run the whole thing in arcgis pro so I know all of the layers for every map in our account. I needed a new line so when I copy and paste the output it goes into excel where the newline makes it easy to read.

Thank you for your help!

Re: Create a List of Layer from Map running into issues where instance has no attributes

anonymous55 — Thu, 15 Dec 2022 16:44:47 GMT

Hello
I have this code which is working with single item id. But I need to run this on all webmaps on my content or org. I am using notebook on AGOL
any idea how can I do this?

from arcgis.gis import GIS from arcgis.mapping import WebMap gis = GIS('home')# if running this from Notebook for ArcGIS in AGOL/Enterprise, replace this line with gis = GIS('home') wmItemId = "myid" #put the id of the webmap in here wmItem = gis.content.get(wmItemId) wm = WebMap(wmItem) for lyr in wm.layers: print(lyr.title) print(lyr.url)