topic Python and Field Calculator in Python Questions

Python and Field Calculator

LeonKincy — Wed, 18 Jun 2014 19:04:40 GMT

I am trying to run the following Python script through Field Calculator

Parser:
Python

Expression:
calctemp(!Value!)

Code Block

def calctemp(newValue):

if newValue > 0:
tempF = (newValue - 273.15)* 1.8000 + 32.00
return tempF

I get a syntax error invalid syntax(<expression>, line 1)

Any suggestions

Re: Python and Field Calculator

MathewCoyle — Sat, 11 Dec 2021 06:50:39 GMT

Make sure it is indented properly.

Pre-Logic Script Code:

def calctemp(newValue):
  if newValue > 0:
    tempF = (newValue - 273.15)* 1.8000 + 32.00
    return tempF

Re: Python and Field Calculator

LeonKincy — Wed, 18 Jun 2014 20:23:07 GMT

I adjusted the indentations, but the error message persists.

Re: Python and Field Calculator

Zeke — Wed, 18 Jun 2014 23:40:20 GMT

Maybe null (None in Python) values in your Value field? Try changing the if statement to: if newValue is not None and newValue > 0: return...etcAnother possibility: is Value a text field?These don't seem like syntax errors to me, but worth a shot. Maybe also check if Value is the real field name, and not an alias. Again not an expected error, but hey...

Re: Python and Field Calculator

LeonKincy — Fri, 20 Jun 2014 17:18:01 GMT

I still have the error. I uploaded a portion of the data file. Value is long. There is one
thing I'm not sure about. Value and newValue are suppose to be interchangeable.
Value is external to calctemp and is used in the call to calctemp. While newValue is
used internally by calctemp.