ArcGIS Pro 2.9 Advanced label expression / code block question

Question

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)

danretired · Answer

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

maybe?

Luke_Pinner · Answer

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

jcarlson · Answer

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 " "