Running GDAL scripts in ESRI Model Builder: Difference between revisions

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I am using the versions of Python, GDAL, and Shapely.
I am using the versions of Python, GDAL, and Shapely.


The script won't run in Model Builder because it sets up its environment for the ESRI version of Python 2.6. This is the symptom
== Virtualenv installation ==
 
My GDAL/Shapely script won't run in Model Builder because it sets up its environment for the ESRI version of Python 2.6. This is the symptom


  TypeError: cannot create weak reference to 'classobj' object
  TypeError: cannot create weak reference to 'classobj' object

Revision as of 17:49, 14 June 2013

I have a script that runs fine standalone but I need it to run in ESRI Model Builder. I am doing this for a client. I avoid Model Builder because scripts are maintainable and reliable.

I am using the versions of Python, GDAL, and Shapely.

Virtualenv installation

My GDAL/Shapely script won't run in Model Builder because it sets up its environment for the ESRI version of Python 2.6. This is the symptom

TypeError: cannot create weak reference to 'classobj' object

I believe this means the python interpreter is getting confused and trying to import from the wrong site packages. I think I can use virtualenv to get around this problem.

I found these instructions and I am following them right now. http://www.tylerbutler.com/2012/05/how-to-install-python-pip-and-virtualenv-on-windows-with-powershell/

I had already installed OSGeo4W yesterday, and modified the environment on my desktop Windows 7 (virtual machine) to load it so that I can run python from command line shells. The link above gives help on how to do that so I won't cover it here.

Installation instructions, the compact edition:

  • Install OSGeo4W (which includes Python 2.7.4) Get it from http://osgeo4w.osgeo.org/
  • Update environment to include these variables
GDAL_DATA         C:\OSGed4W\share\gdal
GDAL_DRIVER_PATH  C:\OSGed4W\bin\gdalplugins
PYTHONHOME        C:\OSGeo4W\apps\Python27
PATH              C:\OSGeo4W\bin;%PATH%;C:\OSGeo4W\apps\Python27\Scripts

The guy that wrote those instructions is apparently a "powershell" user. Why does anyone use powershell? Or Windows?

  1. I went ahead and did pip virtualenvwrapper-powershell on principal even though I won't touch it
  2. but also did pip search virtualenv to find what else was available
  3. and then did pip install virtualenvrwapper-win just in case.

Then my virtual machine rebooted itself. I think it decided it had had enough of me. Now it's installing Windows updates. How annoying.

Next steps: I read the instructions on the virtualenv package page.