topic Field calculator if statement syntax error. in Python Questions

Field calculator if statement syntax error.

MichaelMarlatt1 — Fri, 23 Jul 2021 22:28:20 GMT

I'm using ArcGIS Pro 2.7.

I'm trying to use a python function in the field calculator; which I've done before. I've got a field with data type Double that we'll call Double_Field that I want to use to determine which value to assign to another field. Here's what I'm trying:

NewValue(!Double_Field!)

def NewValue(num):
if num = 0:
return 1
elif num > 0 and num <= 3:
return 2
elif num > 3 and num <= 6:
return 3
elif num > 6 and num <= 9:
return 4
elif num > 9 and num <= 12:
return 5
elif num > 12:
return 6
else:
return 99

When I try to verify the code I get the following error

I've noticed that if I change the "if num = 0:" to "if num < 0:" or anything but a "=" comparison I no longer get a syntax error (but then code no longer does what I need it to do).

Can anyone help me understand what's going on here? I'm a little new to Python but not to programming. It feels a little like a type error but I cannot see how.

Thanks,

Michael Marlatt

Re: Field calculator if statement syntax error.

Tim_McGinnes — Fri, 23 Jul 2021 23:16:08 GMT

In Python the equals comparison is written as ==, so use

if num == 0:

Re: Field calculator if statement syntax error.

DanPatterson — Sat, 24 Jul 2021 00:54:01 GMT

Another case for divmod

def NewValue(num, divisor=3): """Return divmod for a field""" val = divmod(num, divisor)[0] if val > 6: return 99 return val [NewValue(i) for i in a] [0, 1, 2, 3, 4, 5, 6, 99, 99, 99] a array([ 0, 3, 6, 9, 12, 15, 18, 21, 24, 27])

Re: Field calculator if statement syntax error.

MichaelMarlatt1 — Mon, 26 Jul 2021 17:16:09 GMT

Thank you, Tim!