topic Re: Python Label Expression for Arc Map in Python Questions

Python Label Expression for Arc Map

Anonymous User — Wed, 27 Jul 2022 22:13:18 GMT

First timer here, I am attempting to create a number of complex Label expressions in Arc Map. The problems is, how do you get a specific piece of a sting that is in a long text field. For example i am trying to say: if a field contains the string "ATM" then create a label "ATM. See below snippet.

No a simple DQ or Schema change will not work as I need to create labels based on all these categories and then push them to a SDE database ENV. I am trying to improve my python ability. Please any help would be much appreciated. Thanks.

Re: Python Label Expression for Arc Map

AdrianWelsh — Wed, 27 Jul 2022 22:20:42 GMT

Maybe instead of the == in the operator, use "in".

This site has some info on using the "in" operator:

https://stackabuse.com/python-check-if-string-contains-substring/

Re: Python Label Expression for Arc Map

DanPatterson — Wed, 27 Jul 2022 22:23:42 GMT

split Notes by the commas to produce a list, trim the resultant strings if necessary and see if ATM is in the list

I don't have an IDE available, but

val_lst = [i.trim() for i in [Notes].split(",")] if "ATM" in val_lst: ....

Re: Python Label Expression for Arc Map

Anonymous User — Tue, 02 Aug 2022 14:21:24 GMT

thank you, so are you trying to loop an array?

Re: Python Label Expression for Arc Map

JoshuaBixby — Tue, 02 Aug 2022 15:35:46 GMT

There is a Python str.find() method.

Re: Python Label Expression for Arc Map

Anonymous User — Tue, 02 Aug 2022 18:07:56 GMT

I will also give this a try. Have you ever tired using it in a Label expression? That is mostly where I am struggling. The expressions seems to behave different then a normal python IDE environment. Thank you so much for the help!

Re: Python Label Expression for Arc Map

JoshuaBixby — Wed, 03 Aug 2022 15:05:36 GMT

I understand what you mean about the different convention with field names having to be in brackets, but I re-tested using str.find() and it works as expected in a label expression.

Re: Python Label Expression for Arc Map

Anonymous User — Thu, 04 Aug 2022 18:17:11 GMT

Thank you so much can't wait to try it.

Re: Python Label Expression for Arc Map

Anonymous User — Thu, 04 Aug 2022 22:17:13 GMT

def FindLabel ( [NOTES] 😞
if "ATM" in [NOTES]:
return "ATM"

This worked great! Thanks everyone.