topic Python in Field Calculator - mod function in Python Questions

Python in Field Calculator - mod function

Zeke — Thu, 16 Jan 2014 17:42:13 GMT

There are two fields in a topo line feature class, Elev for elevation and LineType10. I want to set LineType10 to 1 if Elev % 10 == 0, and 2 otherwise. The purpose is to be able to symbolize at ten foot intervals. I've got the code below, which doesn't give errors but also doesn't set any values. I've also used the plain % mod symbol. Any ideas why this doesn't run? Thanks.

Pre-Logic

def SetTen(elv, line):   if math.fmod(elv) == 0:     line = 1   else:     line = 2   return line

Window

SetTen( !Elev!, !LineType10!)

Re: Python in Field Calculator - mod function

JoshuaChisholm — Thu, 16 Jan 2014 18:03:41 GMT

Hello Greg,

I'm not sure exactly why your code isn't working, but it might be good to simplify your code a little. First, you are calculating the value of LineType10, so you don't need to pass it as a variable to the function. You can also just return the value for line instead of setting and then returning a variable called line.

Does this work for you?
Pre-Logic:

def isTen(elev):   if elev%10==0:     return 1   else:     return 2

Expression:

isTen( !Elev! )

Also, just to confirm, LineType10 is a int field right?

Re: Python in Field Calculator - mod function

Zeke — Thu, 16 Jan 2014 18:54:50 GMT

Thanks, that worked great. Yes, LineTyp10 is an int. Much appreciated.

Re: Python in Field Calculator - mod function

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