Port to python 3.x [sf#9] about pagmo

[darioizzo]

Originally posted by darioizzo on 2014-01-17 15:52:01.

• assigned_to: Jacco Geul

[darioizzo]

Originally posted by jaccog on 2014-01-18 19:24:52.

• Manual conversion of print statements, some were already function compatible, 2to3 caused print("blaat") to become print(("blaat"))

• Remove del s statement that caused errors, s is cleaned up by for loop in Python 3, this change was not documented afaik.

• Change of CMakeList to point to lib_boostpython3

  from PyGMO import *

Runs without errors now, further testing required.

[darioizzo]

Originally posted by darioizzo on 2014-01-19 14:24:16.

In CMakeList the python version should be autodetected and the correct library then linked. This way both python 2.7 and 3 would be supported at the same time without the user having to change code to make a successfull build

[darioizzo]

Originally posted by jaccog on 2014-01-19 16:50:31.

Good point, changes now implemented in CMakeLists.txt. Problem is that this should go for the source as well, as Python 3 version of PyGMO is not backwards compatible (I tested, too much changed).

This means either having two version of PyGMO in PaGMO or making PyGMO itself compatible with both version. The latter option would introduce a lot of clauses throughout the code and cloud it up. Moreover, the first option allows to simply drop the 2.7 version in the future. On the other hand, in the mean time it requires changes to the code to be made in duplicate for as long as both versions are supported.

[darioizzo]

Originally posted by jaccog on 2014-01-20 10:18:22.

Changes:

• Split PyGMO source into PyGMO3 (Python 3, according to naming convention, e.g. boost). (git mv PyGMO PyGMO3)
• Cloned PyGMO source of Pythen 2.7 from development. (git checkout origin/development -- PyGMO/)
• Enabled different source directories in CMakeLists.txt.

I build from this branch the packages for both version and imported them from their respective python shells.

[darioizzo]

Originally posted by jaccog on 2014-01-23 18:24:22.

• status: open --> pending

[darioizzo]

Originally posted by jaccog on 2014-01-23 18:24:22.

I missed a commit of crucial fix in src/CMakeLists.txt as a result boost_python3 was not correctly added as library link. (Coincidentally, I had a working (test)build in ~/ (d'oh), so I failed to spot this earlier.)

While trying find the problem I improved the way the Python executables and libraries are detected for the different versions.

Meanwhile I successfully used the Python 3 version of PyGMO (followed a few tutorials) and it works like a charm. So I'd suggest closing the ticket. Perhaps someone else might want to test out the build process on a different OS.

Confirmed on:
Linux 3.12.8-1-ck x86_64 GNU/Linux
Python 3.3.3
gcc 4.8.2 20131219
boost 1.55.0

[darioizzo]

Pulled in development ..... closed