1

This code is meant to apply an update cursor to a field called "New_Sq_Mile" when I am populating the field with the area of the polygons. Unfortunately the units are in meters and I need to do a calculation to change those values to miles before they are updated into the table. Here is what I have so far.

cursor = arcpy.UpdateCursor(FinalErase, ["SHAPE@AREA", "New_Sq_Mile"])

for row in cursor:
    row[1] = row[0]
    update.row

del row
del cursor

Is there a way I can do a calculation in the for loop such as

row[1] = row[0]/1606.344
  • Btw: 1 square meter is not 1/1606,344 square mile – BERA May 2 '17 at 19:27
3

You should use the newer Data Access module Cursors, for example da.UpdateCursor. They are alot faster. In your case like this:

import arcpy
with arcpy.da.UpdateCursor(FinalErase,["SHAPE@AREA","New_Sq_Mile"]) as cursor:
    for row in cursor:
        row[1]=row[0]/1606.344
        cursor.updateRow(row)
  • 1
    It worked! Thank you. I am a student and did not realize there was a difference between cursors and data access module cursors. – Noah P May 2 '17 at 19:05

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