[vistrails-users] Issue with List handling

David Koop dakoop at nyu.edu
Tue Aug 5 16:05:28 EDT 2014

Hi Jeff,

The list handling section you reference is a new feature that will appear in a future version of VisTrails.  Please check that you are using the 2.1 documentation available here:


If you are interested in the new list handling features, they are available in the master branch at http://github.com/vistrails/vistrails, and there are methods for running that code using the 2.1 Mac binaries if you are interested.  Let us know,

David Koop
VisTrails Developer

On Aug 5, 2014, at 12:56 PM, Jeffrey Guenther <guenther.jeffrey at gmail.com> wrote:

> Hi, 
> I'm following the tutorial in Section 4.3.2 of the user guide and I can't see to get the list to work.
> I'm asked to create a PythonSource module that outputs 3 lists. It also asks that I set the list depth to 1. I understand what this does. I just can't find where to set it. Where do I set it?
> As a result, workflow gives me an error in the ConcatenateString module saying that it expected a str and it got a list.
> Uncaught exception: "cannot concatenate 'str' and 'list' objects"
> Traceback (most recent call last):
> File "/Applications/VisTrails/VisTrails.app/Contents/Resources/lib/python2.7/vistrails/core/modules/vistrails_module.py", line 400, in update
> File "/Applications/VisTrails/VisTrails.app/Contents/Resources/lib/python2.7/vistrails/core/modules/basic_modules.py", line 741, in compute
> TypeError: cannot concatenate 'str' and 'list' objects
> I'm running VisTrails ( on OS X Mavericks.
> Thanks, 
> Jeff 
> _______________________________________________
> vistrails-users mailing list
> vistrails-users at vistrails.org
> http://lists.vistrails.org/mailman/listinfo/vistrails-users

More information about the vistrails-users mailing list