topic Re: arcpy.da.UpdateCursor "SHAPE@" error when updating M-values in Python Questions

arcpy.da.UpdateCursor SHAPE@ error when updating M-values

EdFarrell — Sat, 11 Dec 2021 09:22:51 GMT

When updating M-values in a feature class using the data access module, I encounter the error below when I run the following code on a selected segment in ArcMap using a Python Add-In call to a Python tool. However, the M-values still update. I am wondering if this is a bug. I also tried this using "SHAPE@JSON" and got the same error, but the M-values still updated. Anybody else have this issue, or have some insight on why this error is being thrown?

I am doing this inside an ArcMap edit session (ESRI Editor). After I run the da.updateCursor, I do some other non 'da' updates, so the commits get pushed through SDE to the underlying SQLServer database. I am on 10.2.1

import json, math 
lin_ref = {'MILEPOST_FR': 1, 'MILEPOST_TO': 10} 
with arcpy.da.UpdateCursor(segmentfc,["SHAPE@"]) as cursor:
    for row in cursor:
        json_obj = json.loads(row[0].JSON)
        mp_to = len(json_obj['paths'][0]) - 1
        fulldist = row[0].getLength('PLANAR', 'FEET')
        conversionfactor = (math.fabs(lin_ref['MILEPOST_TO'] 
                                      - lin_ref['MILEPOST_FR']) / fulldist)
        for i,v in enumerate(json_obj['paths'][0]):
            if i == 0:
                json_obj['paths'][0][2] = float(lin_ref['MILEPOST_FR'])
            else:                 
                # distance in map units between last vertex and current vertex
                x1vert = json_obj['paths'][0][0] - json_obj['paths'][0][i-1][0]
                y1vert = json_obj['paths'][0][1] - json_obj['paths'][0][i-1][1]
                vertdist = math.sqrt(x1vert**2 + y1vert**2)
                vert_lrdist = vertdist * conversionfactor
                json_obj['paths'][0][2] =  json_obj['paths'][0][i-1][2] + float(vert_lrdist)
         for feature in json_obj['paths']:
             pline = arcpy.Polyline(arcpy.Array(
                 [arcpy.Point(X=coords[0], Y=coords[1], M=coords[2])
                 for coords in feature]), row[0].spatialReference, False, True)
        row[0] = pline
        cursor.updateRow(row)  

Traceback (most recent call last):   
File "<string>", line 1896, in execute SystemError: error return without exception set

The line where the error occurs is

cursor.updateRow(row)

Re: arcpy.da.UpdateCursor "SHAPE@" error when updating M-values

ScottDavis — Thu, 03 Sep 2015 15:52:59 GMT

Did you ever solve your problem? I'm having a similar issue.

Re: arcpy.da.UpdateCursor "SHAPE@" error when updating M-values

ShaunWalbridge — Tue, 08 Sep 2015 17:52:00 GMT

Scott and Ed: This issue will be resolved in the next release of ArcGIS.

Re: arcpy.da.UpdateCursor "SHAPE@" error when updating M-values

SteveClark — Tue, 12 Apr 2016 21:58:12 GMT

What was the next release of ArcGIS and would this be patched in 10.2.1?

Re: arcpy.da.UpdateCursor "SHAPE@" error when updating M-values

RebeccaStrauch__GISP — Wed, 13 Apr 2016 00:17:46 GMT

Old thread...but

I believe 10.4.0 was released after Sept 2015, so maybe, per Shaun "This issue will be resolved in the next release of ArcGIS."

10.4.1 was rumored to be released in June, before the UC....but I typically take that as a target date and don't hold them to it.

Re: arcpy.da.UpdateCursor SHAPE@ error when updating M-values

ShaunWalbridge — Wed, 13 Apr 2016 19:37:49 GMT

Yes, the issue was resolved in 10.4.0. It isn't identified as a candidate for service packs, so won't make it into 10.2.1. That said, there is a workaround -- write to a FGDB data source instead of a Shapefile.

topic Re: arcpy.da.UpdateCursor &quot;SHAPE@&quot; error when updating M-values in Python Questions

arcpy.da.UpdateCursor SHAPE@ error when updating M-values

Re: arcpy.da.UpdateCursor "SHAPE@" error when updating M-values

Re: arcpy.da.UpdateCursor "SHAPE@" error when updating M-values

Re: arcpy.da.UpdateCursor "SHAPE@" error when updating M-values

Re: arcpy.da.UpdateCursor "SHAPE@" error when updating M-values

Re: arcpy.da.UpdateCursor SHAPE@ error when updating M-values

topic Re: arcpy.da.UpdateCursor "SHAPE@" error when updating M-values in Python Questions