Adding two attribute fields together in an empty third field.

Discussion created by on Oct 30, 2013
Latest reply on Oct 30, 2013 by xander_bakker
import arcpy, fileinput, os, string
from arcpy import env
env.overwriteOutput = True
env.workspace = "K:/Projects/Project Number/Points.shp"
fc = "shapefile.shp"
verification = arcpy.Exists (fc)
print verification
del verification

arcpy.Addfield_management (fc, "Field3", "DOUBLE", "", "", "", "", "", "", "")
fields = ("Field1", "Field2", "Field3")
with arcpy.da.UpdateCursor (fc, fields) as cursor:
    for row in cursor:
    row[0] = row[2+1]    
del row
del cursor

Hello all.  I am attempting to use python to add a new attribute table column to the existing attribute table columns of a shapefile.  I have gotten this bit of code to work, as seen above and entitled "Field3."  I want to populate values in this new field by adding the values of two other fields, "Field1", and "Field2".  In other words, Field1+Field2=Field3.  I think I am almost there, but I suspect that my "row[2] = row[0+1]" is incorrect.  Any help would be extremely appreciated!