topic Re: ArcGIS Pro 2.9 Advanced label expression / code block question in ArcGIS Pro Questions

ArcGIS Pro 2.9 Advanced label expression / code block question

KeithAddison1 — Fri, 21 Jan 2022 21:45:54 GMT

Anyone know what on earth is wrong with this label expression code block? Once I get the error fixed, how on earth do I invoke it? ArcMAP had the pre logic script code bit separate from the expression, but now its not, how does it work now in Pro? (the help files seem to totally gloss it over)

Re: ArcGIS Pro 2.9 Advanced label expression / code block question

KarstenRank — Fri, 21 Jan 2022 22:08:17 GMT

Hi,

if needs == for equal in python.

Greetings Karsten

Re: ArcGIS Pro 2.9 Advanced label expression / code block question

Anonymous User — Fri, 21 Jan 2022 22:09:39 GMT

Your example doesn't look like valid Python?

Something like:

def FindLabel ( [UNIX Time] ): if [UNIX Time] in ["TOM THUMB", "WILLIAM TELL"]: return [UNIX Time] else: return [UNIX Time]

Re: ArcGIS Pro 2.9 Advanced label expression / code block question

jcarlson — Fri, 21 Jan 2022 22:11:18 GMT

A single "=" in Python is very different from "==", which is what you want to do to check the value of a variable. You also need to give both conditions in full. Anything after the "OR" needs to evaluate to a boolean on its own.

def FindLabel ([NAME1]): if [NAME1] == "TOM THUMB" OR [NAME1] == "WILLIAM TELL": return [NAME1] else: return " "

Alternatively, you can check if the field is in a list of "match" values.

def FindLabel ([NAME1]): if [NAME1] in ["TOM THUMB", "WILLIAM TELL"]: return [NAME1] else: return " "

Re: ArcGIS Pro 2.9 Advanced label expression / code block question

Luke_Pinner — Fri, 21 Jan 2022 23:41:29 GMT

Please post code (and code block expressions) as formatted code not screenshots, makes it so much easier for people to read, copy, test and then hopefully answer.

https://community.esri.com/t5/python-blog/code-formatting-the-community-version/bc-p/1135971

Re: ArcGIS Pro 2.9 Advanced label expression / code block question

DanPatterson — Sat, 22 Jan 2022 00:14:44 GMT

!your_fld! if !your_fld! in ["Tom Thumb", "William Tell"] else " "

maybe?