Using IF operator with Python parser of ArcGIS Field Calculator?

Question

I want to assign numbers to a certain types of building and I need to use field calculator. I tried many different versions of this and I still can't find what's wrong. Could you tell me where do I make a mistake?

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• Robert Spal: obyv column is a short type... I tried float (among others) but didnt help.
• Joseph: Looks like a script for VB instead of Python, perhaps check the parser for VB Script?
• kingmi: Artwork 21 has answered this but just for your info (and sanity) write your field calculator expressions in a text editor that supports python syntax highlighting. Notepad++ or similar. It will greatly decrease frustration - the field calculator is such an unfriendly tool.
• Robert Spal: Yep, I just found out how unfriendly it is. I will use notepad next time. Thanks

Answer 1

Your python syntax is not correct, try:

def myFunc(typ, oby):
 if typ == 'D':
 return 'Z'
 else: return '25'

function call:

myFunc(!TYP!, !obyy!)

Answer 2

Here is a working if/then statement in VBS.

For your code, I would think something like this:

Dim result
if [TYP] = "D" then
 result = "Z"
else result = "25"
end if

And:

obyv = result

Answer 3

Looks like you used "=" rather than "==".

def countRows(rowcount): 
 import arcpy 
 if %rowcount% == 0: 
 return "false" 
 else: 
 return "true"

• PolyGeo: There is no need to import arcpy and I think doing so would make this run very slowly.