Trying to access coordinates of the vertices in polygons using Arcpy and getting “Error in getting object from array”

OlesiaIgnateva

I want to get coordinates of vertices of polygons using arcpy. My code is:

with arcpy.da.SearchCursor(inFC,['OID@','SHAPE@']) as cursor:
    for row in cursor:
        array1=row[1].getPart() # get a single polygon 

        for vertice in range(row[1].pointCount): # a loop to access vertices in a polygon
            pnt=array1.getObject(0).getObject(vertice)
            #print(row[0],pnt.X,pnt.Y)

            try:
                vertices = (pnt.X,pnt.Y)
                print(vertices)
            except:
                print("No vertice")

What I got is a list of coordinates, but not all of them. The code's run breaks by an error:

File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\arcobjects\arcobjects.py", line 105, in getObject return convertArcObjectToPythonObject(self._arc_object.GetObject(*gp_fixargs(args))) RuntimeError: Array: Error in getting object from array

Why this can happen?

DavidPike

There's an oven-ready solution here Read geometries—ArcGIS Pro | Documentation - section headed 'Reading polyline or polygon geometries'

import arcpy

infc = arcpy.GetParameterAsText(0)

# Enter for loop for each feature
for row in arcpy.da.SearchCursor(infc, ["OID@", "SHAPE@"]):
    # Print the current polygon or polyline's ID
    print("Feature {}:".format(row[0]))
    partnum = 0

    # Step through each part of the feature
    for part in row[1]:
        # Print the part number
        print("Part {}:".format(partnum))

        # Step through each vertex in the feature
        for pnt in part:
            if pnt:
                # Print x,y coordinates of current point
                print("{}, {}".format(pnt.X, pnt.Y))
            else:
                # If pnt is None, this represents an interior ring
                print("Interior Ring:")

        partnum += 1