topic Re: Need Help with Python Syntax in Python Questions

Need Help with Python Syntax

AlanToms — Fri, 24 Feb 2012 11:47:04 GMT

Hello folks,

I need help with the proper syntax. I'm sure it's easy I just cant get it. Basically it's telling me that the syntax for my return value, Str(!SHIELD_VAL!), is invalid. I'm using a field calculator to run a check on field HWY_Type and given certain values, it will populate field FEDROUTE with the value of SHIELD_VAL. Any help would be appreciated.

Thank you
Alan

def FedRoute(tvalue):     value = tvalue     if value == 'INT':         return Str(!SHIELD_VAL!)     elif value == 'US':         return Str(!SHIELD_VAL!)  FedRoute(!HWY_Type!)

Re: Need Help with Python Syntax

LeonardWilliamson — Sun, 12 Dec 2021 06:36:24 GMT

Alan,

You need to include the SHIELD_VAL field as an input variable in order to read the values. The code below should fix your problem.

def FedRoute(tvalue, shield):
    value = tvalue
    shield = ''
    if value == 5:
        shield = str(shield)
    elif value == 9:
        shield =  str(shield)
    return shield

FedRoute(!HWY_Type!, !SHIELD_VAL!)

Re: Need Help with Python Syntax

DarrenWiens2 — Sun, 12 Dec 2021 06:36:27 GMT

Won't the above code result in an empty string, every time?

Instead:

def FedRoute(tvalue, shield):
    if tvalue == 'INT':
        return str(shield)
    elif tvalue == 'US':
        return str(shield)

FedRoute(!HWY_Type!, !SHIELD_VAL!)

Re: Need Help with Python Syntax

LeonardWilliamson — Fri, 24 Feb 2012 14:13:40 GMT

Oops, I was testing the code and forgot to change the values to the original

Re: Need Help with Python Syntax

AlanToms — Fri, 24 Feb 2012 17:20:45 GMT

I tried both examples (Leonard's modified to my data, Darrens' exaclty) and they both returned the following error. I looked up 'exceptions.SyntaxError' but I do not understand this enough to solve the issue. Any other suggestions? Thanks for the help on this. It is appreciated.

ERROR 000539: Error running expression: FedRoute("INT", "75
") <type 'exceptions.SyntaxError'>: EOL while scanning string literal (<string>, line 1)
Failed to execute (Calculate Field (FEDROUTE)).

Re: Need Help with Python Syntax

DarrenWiens2 — Fri, 24 Feb 2012 17:33:32 GMT

Did you choose Python as the parser?

Re: Need Help with Python Syntax

AlanToms — Fri, 24 Feb 2012 17:57:12 GMT

Yes, I choose Python 9.3

Re: Need Help with Python Syntax

LeonardWilliamson — Fri, 24 Feb 2012 19:07:44 GMT

Are "Int" and "US" the only values?

Re: Need Help with Python Syntax

AlanToms — Fri, 24 Feb 2012 20:18:07 GMT

Yeah I seem to have NULL values in both the HWY_Type and SHIELD_VAL fields that I think is causing the problem. I'll take a look at it again on Monday.

Re: Need Help with Python Syntax

AlanToms — Wed, 29 Feb 2012 18:05:11 GMT

The code samples you both provided worked. I discovered some issues with the data iteself that didnt want to work.

Thank you for the help.
Alan