topic Re: Drawing Alert leads me to Labeling Expression error ? in ArcGIS Pro Questions

Drawing Alert leads me to Labeling Expression error ?

DEAF_PROBERT_68 — Mon, 21 Apr 2025 14:57:24 GMT

Hi,

Before I dive into more detail. I have an issue with a layer that somebody wrote this expression into this labeling expression. I have the Drawing Alert that tells me . I am trying to understand this and I am not sure how to fix it.

The layer I had was from an original layer came from the upper management and they did this for the whole country and I had to use it to clipped it to smaller area for our project. So when you clipped the layer , I believe some of the expression did not work in the label expression.

So here is the Expression from the Labeling section is what I have here from an original layer:

def FindLabel ( [TRAIL_NO], [ADMIN_ORG], [MANAGING_ORG], [TRAIL_NAME], [NATIONAL_TRAIL_DESIGNATION] ): if [ADMIN_ORG].startswith('02'): s='.' if [ADMIN_ORG].startswith('0201'): return [TRAIL_NO] [2:] else: return [TRAIL_NO].split(s,1)[0] elif [ADMIN_ORG].startswith('0919') or [ADMIN_ORG] .startswith('0922') or [ADMIN_ORG] .startswith('0903')or [ADMIN_ORG] .startswith('0913'): return [TRAIL_NO] [2:] elif [ADMIN_ORG] .startswith('0909') or [ADMIN_ORG] .startswith('0907'): return [TRAIL_NO] [2:].replace('-','') elif [ADMIN_ORG] .startswith('0904'): return [TRAIL_NO] [1:] elif [ADMIN_ORG].startswith('0915'): return [TRAIL_NO][4:] elif [ADMIN_ORG].startswith('08'): if [ADMIN_ORG].startswith('0805') or [ADMIN_ORG].startswith('0810'): return [TRAIL_NO].replace('TRBS','').replace('TR','')[1:] else: return [TRAIL_NO].replace('TRBS','').replace('TR','') elif [ADMIN_ORG].startswith('04'): if [ADMIN_ORG].startswith('0419'): return [TRAIL_NO] [1:] elif [ADMIN_ORG].startswith('0402'): return [TRAIL_NO][:3] elif [MANAGING_ORG].startswith('0402'): return [TRAIL_NO][:3] elif [ADMIN_ORG].startswith('040702') and [TRAIL_NO].startswith('32000.'): return [TRAIL_NO].replace('32000','').replace('.','') elif [ADMIN_ORG].startswith('040702'): return [TRAIL_NO][2:] else: return [TRAIL_NO][1:] elif [ADMIN_ORG].startswith('0303'): return [TRAIL_NO] [2:] elif [MANAGING_ORG].startswith('031204'): return [TRAIL_NO].replace('MT-','') else: return [TRAIL_NO].lstrip("0").replace('.', '-').replace('TER-','').replace('TRD','')

I have the clippped layer here and I have looked into the attributes and I can see some of the split it mention in the expression and yes I can see some of the numbers like this 157.2 or "Name of trail".456

The Problem is the error that tells me

Traceback (most recent call last):
File "<expression>", line 1, in <module>
File "<string>", line 7, in FindLabel
AttributeError: 'NoneType' object has no attribute 'split'

I am clueless here and I am not sure what the line 7 is and I am not sure where to find it.

Please excuse my grammar here. I am deaf and I try my best to understand how it works and it will help me to understand better down in the road should I came up the same thing in the future...

Thanks GIS friends !

I am in the VDI, Citrix, and ArcGIS Pro 3.3.4.

Re: Drawing Alert leads me to Labeling Expression error ?

KenBuja — Mon, 21 Apr 2025 13:38:27 GMT

It's difficult to follow the logic of this code. When posting code (especially Python code, where indenting is important), please use the "Insert/Edit code sample" button.

Re: Drawing Alert leads me to Labeling Expression error ?

DEAF_PROBERT_68 — Mon, 21 Apr 2025 14:00:06 GMT

Ok will do.

Re: Drawing Alert leads me to Labeling Expression error ?

KenBuja — Mon, 21 Apr 2025 14:25:10 GMT

Please fix the indenting

Re: Drawing Alert leads me to Labeling Expression error ?

KenBuja — Tue, 22 Apr 2025 14:31:42 GMT

If a record contain a null value in [TRAIL_NO], then you'll get the split error. You have to check whether that attribute is not null before attempting to split it (line 7).

Re: Drawing Alert leads me to Labeling Expression error ?

DEAF_PROBERT_68 — Tue, 22 Apr 2025 17:07:36 GMT

I fixed it and it worked; however on line 2 which I am not sure about but I can see the Admin_Org has null and I don't know how to include it in the code ?

Traceback (most recent call last):
File "<expression>", line 1, in <module>
File "<string>", line 2, in FindLabel
AttributeError: 'NoneType' object has no attribute 'startswith'

And here is the screenshot for the field name here is

Re: Drawing Alert leads me to Labeling Expression error ?

KenBuja — Tue, 22 Apr 2025 18:09:47 GMT

You'll have to do the same thing with any field that a text function (split, startswith, replace, etc). Since most of the conditional lines are testing [ADMIN_ORG], you should put that at the beginning, like this:

def FindLabel ( [TRAIL_NO], [ADMIN_ORG], [MANAGING_ORG], [TRAIL_NAME],[NATIONAL_TRAIL_DESIGNATION]): if [ADMIN_ORG]: if [ADMIN_ORG].startswith('02'): //

You can put that on one line, like this:

elif [MANAGING_ORG] and [MANAGING_ORG].startswith('031204'):