[vtk-developers] VTK-py3k is ready for testing

[Prabhu Ramachandran]

Hi David,

Thanks a ton for the python3 work.  I have been under the weather but will try
and find some time to test things out.  I am not sure I will be quick enough to
contribute any fixes.

Thanks again for the fantastic work on this.

cheers,
Prabhu

On 8/6/15 11:34 PM, David Gobbi wrote:
> I'm planning to merge the py3k branch later today (around 4pm or so ET). This is
> going to cause some test failures on any dashboards that are still running
> python 2.5 (do any of these still exist?).
> 
> Backwards compatibility for Python 2.6 and 2.7 should be excellent. They saw
> only to major changes:
> 1) The wrappers use new-style classes, i.e. every VTK class is wrapped as a type
> object.  So type(vtkDataArray()) is vtkDataArray, unlike before when
> type(vtkDataArray()) was 'vtkobject'.
> 2) The wrappers support the new n-dimensional buffer interface, so
> numpy.asarray(vtk_array) creates a zero-copy numpy array from a VTK data array.
> 
> Python 3.2 and higher should also work well, with some caveats:
> 1) VTK is still set up to use python 2 by default, so when configuring VTK with
> cmake, you must provide the paths to the python 3 executable, the python 3
> include dir, and the python 3 library.
> 2) Most of the python tests and examples will only run with python 2.
> 3) Most of VTK's python utility modules (e.g. vtk.tk <http://vtk.tk>) will only
> run with python 2.
> 4) The wrappers will encode python strings to utf8 bytes before passing it to VTK.
> 
> Obviously, converting the utility modules and tests to python 3 will be a lot of
> work.  And keeping support for python 2 is a must ... all code must run with
> python 2.6, 2.7, and 3.2+.
> 
> I'm particularly interested in hearing from people who are willing to help with
> these modules: vtk.wx,  vtk.qt4, vtk.gtk
> 
> Of course if anyone wants to convert some examples or tests, shoot an email to
> the list and I'll try to coordinate.  If you want to update the wiki examples,
> then you can just log into the wiki and edit them.
> 
>  - David
> 
> 
> On Wed, Aug 5, 2015 at 6:51 PM, Andrew Maclean <andrew.amaclean at gmail.com
> <mailto:andrew.amaclean at gmail.com>> wrote:
> 
>     Ok thanks. I'll check it out soon. Just testing my builds and various scripts
> 
>     On Thu, Aug 6, 2015 at 10:45 AM, David Gobbi <david.gobbi at gmail.com
>     <mailto:david.gobbi at gmail.com>> wrote:
> 
>         Thanks, Andrew.  I just pushed the CommonCore test updates to the branch.
> 
>          - David
> 
> 
>         On Wed, Aug 5, 2015 at 5:11 PM, Andrew Maclean
>         <andrew.amaclean at gmail.com <mailto:andrew.amaclean at gmail.com>> wrote:
> 
>             Hi David,
> 
>             Wonderful news. 
> 
>             Definitely be glad to help.
>             Setting up a Python 3.4 environment in Windows 10 on my laptop now.
>             I'll be using Anaconda Python.
> 
>             Once this is done, I'll maintain both a python 2.7 and Python 3.4
>             build and see how things go.
> 
>             Regards
>                Andrew
> 
> 
>             On Thu, Aug 6, 2015 at 1:44 AM, David Gobbi <david.gobbi at gmail.com
>             <mailto:david.gobbi at gmail.com>> wrote:
> 
>                 So, here's a brief update on python 3 status:
> 
>                 The python-py3k merge branch compiles and runs with Python 3.2,
>                 3.3, 3.4 and also Python 2.5, 2.6, 2.7 (I tried all six).  So,
>                 yes, you can build VTK against Python 3, and you can run VTK
>                 programs with Python 3.  I'll be doing a bit of cleanup of the
>                 next few days, but the current branch is very close to what I
>                 plan to merge.
> 
>                 However: the test code in VTK is all written for Python 2, so
>                 right now the Python 3 buildbot that Ben has set up is showing
>                 all red for the testing.  Converting the tests will be a lot of
>                 work, especially because the tests must continue to run with
>                 Python 2.6 and 2.7 (definitely not 2.5, though).  Andrew, you
>                 mentioned that you might be able to provide some assistance, I
>                 would be very grateful for anything you have to offer.
> 
>                 I've already begun converting the python tests in Common/Core,
>                 because these test the core features of the wrappers.
> 
>                  - David
> 
> 
> 
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