topic Copying from a list of feature layers using python in Python Questions

Copying from a list of feature layers using python

MehrshadNourani — Thu, 24 Jul 2014 17:22:46 GMT

I am trying to copy feature layers using the following code, but get no results. Can anyone help me understand why my code does not work?

import os

import arcpy

arcpy.env.workspace = ws = 'C:\\WorkSpace\\sahie_saipe\\sahie_saipe.gdb'

dictionary_Layer = {'co06_Layer':'co06', 'co07_Layer':'co07', 'cnty08_Layer':'co08', 'co09_Layer':'co09', 'co10_Layer':'co10', 'co11_Layer':'co11', 'co12_Layer':'co12', 'st_Select':'state'}

for layer in arcpy.mapping.ListLayers(mxd):

if layer in dictionary_Layer:

old = os.path.join(ws, layer)

new = os.path.join(ws, dictionary_Layer[layer])

try:

arcpy.CopyFeatures_management(old,new,"")

print 'copy %s to %s' %(layer, dictionary_Layer[layer])

except:

print 'Could not copy %s'

Re: Copying from a list of feature layers using python

KerryAlley — Thu, 24 Jul 2014 18:07:46 GMT

Hello,

The variable "layer" represents the layer object, not the name of the layer (a string). You therefore need to look for layer.name in the dictionary, and more specifically look in the list of the dictionary keys. I've copied your code and edited lines 6-12 below for clarification... hopefully I didn't introduce typos!

Kerry


import os
import arcpy 
arcpy.env.workspace = ws = 'C:\\WorkSpace\\sahie_saipe\\sahie_saipe.gdb'
dictionary_Layer = {'co06_Layer':'co06', 'co07_Layer':'co07', 'cnty08_Layer':'co08', 'co09_Layer':'co09', 'co10_Layer':'co10', 'co11_Layer':'co11', 'co12_Layer':'co12', 'st_Select':'state'}
for layer in arcpy.mapping.ListLayers(mxd):
    if layer.name in dictionary_Layer.keys():
        old = os.path.join(ws, layer.name)
        new = os.path.join(ws, dictionary_Layer[layer.name])
        try:
            arcpy.CopyFeatures_management(old,new,"")
            print 'copy %s to %s' %(layer.name, dictionary_Layer[layer.name])
        except:
            print 'Could not copy %s'(layer.name)

            print 'Could not copy %s'

Re: Copying from a list of feature layers using python

IanMurray — Thu, 24 Jul 2014 18:16:38 GMT

Hi Mehrshad,

First off, you never define what your mxd variable is. To use the arcpy.mapping.ListLayers, you need to make a map document object which you can call the ListLayers on. Use mxd = arcpy.mapping.MapDocument(r"Filepathtoyourmapdocumenthere") to create your MapDocument object first.

Secondly, you are copying feature layers and making feature classes it seems, which is fine, but you shouldn't need the old = os.path.join(ws, layer), since feature layers are stored in memory and not on the hard drive. If you are referencing existing feature classes, then its fine as is. If not though I would take out the old = , and put in this CopyFeatures_management(layer.name, new) for your copy features statement. Also you would need to use that layer.name for checking agaisnt your dictionary.

Hope this helps you out.

Re: Copying from a list of feature layers using python

MehrshadNourani — Thu, 24 Jul 2014 19:02:39 GMT

Kerry, Ian,

Thank you very much for your help. I incorporated your suggestions (below) but no results!

import os

import arcpy

arcpy.env.workspace = ws = 'C:\\WorkSpace\\sahie_saipe\\sahie_saipe.gdb'

dictionary_Layer = {'co06_Layer':'co06', 'co07_Layer':'co07', 'cnty08_Layer':'co08', 'co09_Layer':'co09', 'co10_Layer':'co10', 'co11_Layer':'co11', 'co12_Layer':'co12', 'st_Select':'state'}

mxd = arcpy.mapping.MapDocument('C:\\WorkSpace\\sahie_saipe\\sahie_saipe.mxd')

for layer in arcpy.mapping.ListLayers(mxd):

if layer.name in dictionary_Layer.keys():

# old = os.path.join(ws, layer.name)

new = os.path.join(ws, dictionary_Layer[layer.name])

try:

arcpy.CopyFeatures_management(layer.name, new,"")

print 'copy %s to %s' %(layer.name, dictionary_Layer[layer.name])

except:

print 'Could not copy %s'(layer.name)

print 'Could not copy %s'

Re: Copying from a list of feature layers using python

KerryAlley — Thu, 24 Jul 2014 21:24:00 GMT

Since Ian brought it up, I'll add that you don't need specify the full path for the output feature class either, as long as you want it to be saved in the already-specified workspace.

As with most geoprocessing tools, CopyFeatures_management honors selections and definition queries, so make sure you know what you're copying.

If the code below doesn't work, try commenting out the try and except lines (and de-indenting the arcpy.CopyFeatures_management and print lines) to see what error occurs.

Also, I found typos in my previous post. There should only be one line (that looks like this) in the except block:

print 'Could not copy %s'%layer.name

import os  
import arcpy   
arcpy.env.workspace = ws = 'C:\\WorkSpace\\sahie_saipe\\sahie_saipe.gdb'  
dictionary_Layer = {'co06_Layer':'co06', 'co07_Layer':'co07', 'cnty08_Layer':'co08', 'co09_Layer':'co09', 'co10_Layer':'co10', 'co11_Layer':'co11', 'co12_Layer':'co12', 'st_Select':'state'} 
mxd = arcpy.mapping.MapDocument('C:\\WorkSpace\\sahie_saipe\\sahie_saipe.mxd') 
for layer in arcpy.mapping.ListLayers(mxd):  
    if layer.name in dictionary_Layer.keys():  
       try:  
          arcpy.CopyFeatures_management(layer.name, dictionary_Layer[layer.name]) #only 2 required parameters, full path not necessary to output to workspace 
          print 'copy %s to %s' %(layer.name, dictionary_Layer[layer.name])  
       except:  
          print 'Could not copy %s'%layer.name

Re: Copying from a list of feature layers using python

MehrshadNourani — Fri, 25 Jul 2014 10:42:46 GMT

Kerry,

Thank you verey much for your help. I'll try your suggestions and see if the code would work.

Best

Re: Copying from a list of feature layers using python

RhettZufelt — Fri, 25 Jul 2014 18:22:28 GMT

Not anywhere I can test, but think it might be related to this line:

if layer.name in dictionary_Layer.keys():

In the past, to check if a value is in a dictionary, I used syntax similar to this to get the results:

if (dictionary_Layer.has_key(layer.name)):
     do stuff

Re: Copying from a list of feature layers using python

KerryAlley — Fri, 25 Jul 2014 19:12:52 GMT

Our methods of searching for keys have the same functionality, and they're both described here.

Re: Copying from a list of feature layers using python

XanderBakker — Mon, 28 Jul 2014 01:57:34 GMT

actually..

if layer.name in dictionary_Layer:

... is enough, since it automatically checks for the keys...