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Need Help with Python Syntax

Question asked by alantoms on Feb 24, 2012
Latest reply on Feb 29, 2012 by alantoms

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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!)

mrlenny Feb 24, 2012 6:13 AM

Correct Answer

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

See the reply in context

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mrlenny Feb 24, 2012 4:32 AM

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!)

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dkwiens

Feb 24, 2012 6:11 AM

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!)

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mrlenny Feb 24, 2012 6:13 AM

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

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alantoms Feb 24, 2012 9:20 AM

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)).

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dkwiens

Feb 24, 2012 9:33 AM

Did you choose Python as the parser?

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alantoms Feb 24, 2012 9:57 AM

Yes, I choose Python 9.3

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mrlenny Feb 24, 2012 11:07 AM

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

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alantoms Feb 24, 2012 12:18 PM

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.

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alantoms Feb 29, 2012 10:05 AM

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

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