I am just starting with Python and ArcGIs so here is my question:

I have the column "DB_Low" (Type "Long") and want to fill a new column by changing values. The new column will be a Float-Type field.

So here is what I tried so far:

if !DB_Low! == 0:

  return 0


  return  !DB_Low! + 2.25

But I get the Error: 000539 SyntaxError, invalid syntax (, line 1)

Can someone tell me the mistake in my code?

  • FYI quite often I will check the help file right from the field calculator for small syntax/formatting and function references.
    – Barrett
    Jun 9, 2016 at 14:17

1 Answer 1


In the code block window of the field calculator, try using:

def new(DB_Low):
    if DB_Low == 0:
        return 0
        return DB_Low + 2.25

And then in the expression window:


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