topic Re: ListLayers error in Python Questions

ListLayers error

DEAF_PROBERT_68 — Mon, 09 Feb 2015 18:13:35 GMT

I am having an syntax error from Pyscripter here and not sure why but I have a shapefile at the top of the TOC list which is the first and should be number zero when writing a listlayers as a zero but I still get the error .

The error is :

Traceback (most recent call last):

File "C:\Student\python\GeoTIFF.py", line 16, in <module>

gridlayer = arcpy.mapping.ListLayers(mxd,'JERGRIDINDEX', df,)[0]

IndexError: list index out of range

Take a look here the sytanx:: gridlayer = arcpy.mapping.ListLayers(mxd,'JERGRIDINDEX', df,)[0]

Re: ListLayers error

JakeSkinner — Mon, 09 Feb 2015 18:26:28 GMT

Hi Robert,

Would you be able to post all of your code? This will help troubleshoot this faster.

Re: ListLayers error

DEAF_PROBERT_68 — Mon, 09 Feb 2015 18:33:44 GMT

Here you go:

mport arcpy.mapping, os

mxd = arcpy.mapping.MapDocument (r"E:\workspace\Test.mxd")

arcpy.env.workspace = r"E:/workspace/images/"

df = arcpy.mapping.ListDataFrames(mxd)[0]

df.scale = 40000

gridlayer = arcpy.mapping.ListLayers(mxd,'JERGRIDINDEX', df,)[0]

arcpy.SelectLayerByAttribute_management(gridlayer, "NEW_SELECTION")

for row in arcpy.SearchCursor(gridlayer):

df.panToExtent(row.shape.extent)

arcpy.RefreshActiveView()

filename = "E:/workspace/images/" + \

str(row.getValue("PageNumber")).zfill(4) + ".tif"

arcpy.mapping.ExportToTIFF(mxd, filename, df, df_export_width= 65000, df_export_height=30000,geoTIFF_tags=True)

## arcpy.mapping.ExportToTIFF(mxd, filename, df, df_export_width= 1280, \

## df_export_height=440, geoTIFF_tags=True)

print arcpy.GetMessages()

Re: ListLayers error

JakeSkinner — Mon, 09 Feb 2015 18:41:20 GMT

Everything looks correct, unless you are mis-spelling the layer name. However, since you want the first layer, you will not have to specify a name. Try the following:

gridlayer = arcpy.mapping.ListLayers(mxd,'', df,)[0]

One thing I did just notice is the arcpy.env.workspace. Since you are specifying an 'r' before the path, you will want to change the forward slashes to backslashes. Ex:

arcpy.env.workspace = r"E:\workspace\images"

Re: ListLayers error

DEAF_PROBERT_68 — Mon, 09 Feb 2015 18:56:07 GMT

I did the same thing what you suggest. I can try and run it from Python window but Pyscripter should be able to recongize it. Can I run this script from Pyscripter rather than in python window ?

Re: ListLayers error

JakeSkinner — Mon, 09 Feb 2015 19:11:03 GMT

Yes, you should be able to run this in Pyscripter.

Re: ListLayers error

DEAF_PROBERT_68 — Mon, 09 Feb 2015 19:18:50 GMT

How can I sync this Pyscripter to Arcmap ?

Re: ListLayers error

JakeSkinner — Mon, 09 Feb 2015 19:24:17 GMT

I'm not quite sure what you mean. When the code is executed in Pyscripter, you will not see the map's extent updated. However, you should still have the TIFF file created.

Re: ListLayers error

DEAF_PROBERT_68 — Mon, 09 Feb 2015 19:37:47 GMT

I am thinking maybe it is not working.How can Pyscripter communicate with ArcMap if I write these codes ?

Re: ListLayers error

DEAF_PROBERT_68 — Mon, 09 Feb 2015 19:40:30 GMT

My Pyscripter versions is 2.5.3.0 x86 Is that correct for ArcGIS 10.1 Python 2.7 ?

Re: ListLayers error

GusMartinka — Mon, 09 Feb 2015 19:55:34 GMT

Check out the Execute and debug your tool section for help attaching pyscripter to ArcMap for debugging.

Re: ListLayers error

XanderBakker — Sat, 11 Dec 2021 22:25:44 GMT

You should be OK with that version of PyScripter (it hasn't been updated in years). If it was installed after ArcGIS, it will probably find the python installation that comes with ArcGIS in C:\Python27\ArcGIS10.1.

You can check the Python path in the Tools menu to see which paths are used.

When you run some simple code like:

import arcpy
print arcpy.ProductInfo()

It will print the license level of ArcGIS. If this works you can work with PyScripter and ArcGIS.

In you code you reference the mxd document by path instead of using the keyword "CURRENT".

That is all it takes as Jake Skinner‌ already explained.

Running the code from as stand alone script (from output ArcMap) will open the MXD on the background and process it. There is not much more to it...

Re: ListLayers error

DEAF_PROBERT_68 — Tue, 10 Feb 2015 19:26:24 GMT

Thanks. I went back to Pyscripter and try again and change from gridlayers to imagelayer

Now I see that ListLayers had the errror so I am thinking that by looking at the Varibales and it is not there...

is that why it could not run it ?

Re: ListLayers error

DEAF_PROBERT_68 — Tue, 10 Feb 2015 20:05:49 GMT

Never mind. I did checked and ListLayers still there and I think the main problem is I copied and paste when I first started and gave me bunch of problems so I am thinking instead of copy and past . I might have to do typing rather than copy and paste ?

What do you say ?