Error when trying to calculate a field

MichaelMiller2

Anyone tell me why this code is returning this error?  It creates the latTemp field, and I can see it after it crashes, but it will not calculate it.  

ERROR:

<class 'arcgisscripting.ExecuteError'>: Failed to execute. Parameters are not valid. ERROR 000728: Field latSTR does not exist within table Failed to execute (CalculateField).  Failed to execute (ConvertDMS2DD). Failed at Mon Feb 25 11:25:18 2013 (Elapsed Time: 9.00 seconds)

CODE:

import arcpy, sys, os arcpy.env.overwriteOutput = 1  # select the feature class  fc = arcpy.GetParameter(0) # select the latitude field to convert latField2 = arcpy.GetParameter(1) latField = "%s%s%s" % ('!', latField2, '!') arcpy.AddMessage("latField2 = " + str(latField2) +"   latField = " +latField) lonField2 = arcpy.GetParameter(2) lonField = "%s%s%s" % ('!', lonField2, '!') arcpy.AddMessage("lonField2 = " + str(lonField2) +"  lonField = " +lonField) # set lattitude output field latFieldDD = "latDD" # set longitude output field lonFieldDD = "lonDD" # set temp lattitude field, used to store lat field as string used in function latTemp = "latSTR" # set temp longitude field, used to store lon field as string used in function lonTemp = "lonSTR"  latExp = "lat(%s%s%s)" % ('!',latTemp,'!') codeblockLAT = """def lat(dms):     latdeg = float(dms[0:2])     latmin = float(dms[2:4])     latsec = float(dms[4:6])     latdd = latdeg + (latmin / 60) + (latsec / 3600)     return latdd""" lonExp = "lon(%s%s%s)" % ('!',lonTemp,'!') codeblockLON = """def lon(dms):     londeg = float(dms[0:3])     lonmin = float(dms[3:5])     lonsec = float(dms[5:7])     londd = (londeg + (lonmin / 60) + (lonsec / 3600)) * -1     return londd"""  #copy the lat numeric to a string arcpy.AddField_management(fc, latTemp, "TEXT", "", "", 16) arcpy.AddField_management(fc, latFieldDD, "FLOAT", 16, 6, 16) arcpy.AddMessage("added lat fields: %s and %s" % (latTemp, latFieldDD))  #copy the lon numeric to a string arcpy.AddField_management(fc, lonTemp, "TEXT", "", "", 16) arcpy.AddField_management(fc, lonFieldDD, "FLOAT", 16, 6, 16) arcpy.AddMessage("added lon fields: %s and %s" % (lonTemp, lonFieldDD))  # do calculations arcpy.CalculateField_management(fc, latTemp, latField, "PYTHON") arcpy.CalculateField_management(fc, latFieldDD, latExp, "PYTHON", codeblockLAT) arcpy.DeleteField_management(fc, latTemp)  arcpy.CalculateField_management(fc, lonTemp, lonField, "PYTHON") arcpy.CalculateField_management(fc, lonFieldDD, lonExp, "PYTHON", codeblockLON) arcpy.DeleteField_management(fc, lonTemp)

curtvprice

I was successful running the entire script using the same test data set before converting to a script tool.  Seems to be behaving differently in the script tool.

You are using GetParameter(), which returns an arcpy Field object, not a field name -- if you set it up as a script tool. From the command line, or IDLE, etc., the parameter is always a string, but from a toolbox, ArcGIS can pass the argument as a bona-fide arcpy object.

If this is a Field parameter you should use GetParameterAsText() if you want the field name as text - for example, for use in a Calculate Field expression. Python's  sys.argv and arcpy.GetParameterAsText are fairly equivalent, although I am pretty sure GetParameterAsText can handle a longer string. (In code examples, you usually see GetParameterAsText because this allows the script to used easily inside or outside ArcGIS.)

Note, there is a new tool in 10x that does DMS to DD conversion, at least many of the conversions you'd want: ConvertCoordinateNotation_management. (I had been asking for this tool since the 1980's!)