Converting Field Calculator Pre-Logic Script to pyscript

CliveCartwright

I've been struggling to emulate a simple Field Calculator function as pyscript. When I try, I get parsing errors.

For example, how should this simple function (when manually applied in the Field Calculator tool) look when written up as pyscript?

In Pre-Logic Script Code:

def LookUp ( a, b ) :

  if ( a == 0 ) : 

    newval = 0

  else :

    newval = b

  return newval

In FIELD =

LookUp ( !MAX_RANK!, !Shape_Area! )

Any advice will be much appreciated.

CliveCartwright

I have made it work!!!!!!

Code I used:

# Populate SUBJECT_AREA only if there is a Rank shown in MAX_RANK field.

expression = "LookUp(!MAX_RANK!, !Shape_Area!)"

codeblock = "def LookUp(MAX_RANK, Shape_Area):\n\

    if MAX_RANK == 0:\n\

        return 0\n\

    else:\n\

        return Shape_Area"

gp.CalculateField_management(currentWorkspace + "/myDataset", "SUBJECT_AREA", expression, "PYTHON", codeblock)