trouble with clip in search cursor

[jkass]

Having trouble with this script. Trying to clip the streams layer by each row of a watershed polygon. Getting the error "in Clip raise e". Any suggestions?

import arcpy
from arcpy import env
import os

arcpy.env.workspace = "path"
arcpy.env.overwriteoutput = 1
streams = "streams.shp"
rows = arcpy.SearchCursor("ws_boundary.shp")
for row in rows:
wsname = str(row.DWRHANAME)
outshp = "streams\\str" + "_" + wsname.replace(" ", "_") + ".shp"
arcpy.Clip_analysis(streams, rows, outshp)
print str(row.DWRHANAME) + "_has finished"

[Chris_Fox]

Hi Jamie,

The problem is you are attempting to pass a cursor object in as the clip features paramater:

arcpy.Clip_analysis(streams, rows, outshp)

Instead try passing in just the geometry from the row. For example:

feat = row.Shape #Where Shape is equal to the shape field in the feature class
arcpy.Clip_analysis(streams, feat, outshp)

Also looking at it you may have a problem with the outshp variable as you are setting it equal to streams.shp\\str_XX_XX.shp which is not a valid output feature class path.

[kass3]

Thank you! Would would have thought that the "shape" is used to "clip"?

*kicking myself*

[SaultDon]

I am trying to do the same thing, and I am new to Python so am looking for some input on this script I am trying to run.

Using ArcGIS 9.3.1, I have a shapefile of index grids in shapefile format with a text field called [NAME] that contains a UID for each grid (ie, Grid-1, Grid-2, etc...)

I would like to clip the lines to these grids with a subset of lines for each grid.

Below is my script thus far (also attached as .py Clip_wCursor.py and shapefiles with directories are in .7z gis.7z file):

# ---------------------------------------------------------------------------
# Clip_wCursor.py
# Created for ArcGIS 9.3.1
#   (clip generated by ArcGIS/ModelBuilder)
# Attempted cursor mods by a newb, Donovan
# ---------------------------------------------------------------------------

# Import system modules
import sys, string, os, arcgisscripting

# Create the Geoprocessor object
gp = arcgisscripting.create()

# Load required toolboxes...
gp.AddToolbox("C:/Program Files/ArcGIS/ArcToolbox/Toolboxes/Analysis Tools.tbx")

# assign variables...
grids = "C:\\gis\\data\\grids.shp"
lines = "C:\\gis\\data\\lines.shp"
rows = gp.SearchCursor(grids)
row = rows.Next()
feat = row.Shape
for row in rows:
    gname = str(row.NAME)
Output = "grd" + "_" + gname + ".shp"

# Process: Clip...
gp.Clip_analysis(lines, feat, Output, "")

I encounter the error:

Traceback (most recent call last):
  File "C:\gis\script\Clip_wCursor.py", line 23, in <module>
    for row in rows:
TypeError: 'geoprocessing cursor object' object is not iterable

Is it because I have incorrectly defined my row variable?

[SaultDon]

Thank you! Would would have thought that the "shape" is used to "clip"?

*kicking myself*

Got it working, here is my final script if anyone needs to see 'exactly' how it works (like I did lol).

Clip_wCursor_v2a.py