topic Re: Extract value from a one line shape file arcpy in ArcGIS Pro Questions

Extract value from a one line shape file arcpy

MohamadAchour — Wed, 17 Mar 2021 08:27:07 GMT

Hello,

I have a shapefile that contains one line, and I need to extract the "Shape Length" value from his attribute table using python.

Any suggestion?

Re: Extract value from a one line shape file arcpy

JayantaPoddar — Wed, 17 Mar 2021 08:48:12 GMT

Where do you want to extract it to?

Using Python Parser of Field Calculator?

!shape.length@<units>!

e.g.: For calculating length in yards

!shape.length@yards!

Geometry Calculation

Re: Extract value from a one line shape file arcpy

MohamadAchour — Wed, 17 Mar 2021 09:03:05 GMT

I only need the value of the "shape length" cell. Then, I will use this value in the script.

Re: Extract value from a one line shape file arcpy

MohamadAchour — Wed, 17 Mar 2021 09:08:42 GMT

if there is a method to calculate the length of the polyline also it can work.

Re: Extract value from a one line shape file arcpy

DavidPike — Wed, 17 Mar 2021 09:26:18 GMT

a search cursor will do the trick SearchCursor—ArcGIS Pro | Documentation

import arcpy fc = 'c:/data/your_shapefile.shp' #look at the geometry tokens in the help url #for more understanding fields = ['SHAPE@LENGTH'] #open cursor with arcpy.da.SearchCursor(fc, fields) as cursor: #for every row in the shapefiles attribute table for row in cursor: #row[0] is the first field specified when opening the cursor #next field rould be row[1]...etc #print the length print(row[0])