rosrun python executable

asked 2015-01-09 03:26:21 -0500

clauniel
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updated 2015-01-09 04:16:39 -0500

How do you set which python executable rosrun uses? I am on Arch linux and I assume rosrun defaults to python 3 while trying to interpret python 2.7 source, which of course fails.

EDIT: The issue was in the package scripts. They used "#!/usr/bin/env python" which defaults to python3 on Archlinux. I changed it to "#!/usr/bin/python2".

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answered 2015-02-20 07:36:58 -0500

bchr

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On Arch, since /usr/bin/python points to Python 3, some steps need to be taken when using ROS:

Force the use of Python 2 by providing Python 2 paths/executables to catkin/CMake (as explained in the wiki),
Patch shebang lines of Python scripts to ensure that Python 2 is used. All the ROS packages available in the AUR are fixed automatically thanks to a script available in ros-build-tools:

# Fix Python2/Python3 conflicts
/usr/share/ros-build-tools/fix-python-scripts.sh -v 2 /path/to/src/dir

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answered 2015-01-09 03:34:09 -0500

kokirits

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updated 2015-01-09 03:35:03 -0500

gedit ~/.bashrc

or

gedit ~/[your_workspace]/devel/setup.bash

And check the Python path.

I once had a similar problem where the Anaconda python interpreter messed up with catkin_make and srvs.

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Afaik, PYTHONPATH points to libraries, not the executable. Changing it did not make a difference, however you led me on the right track. Thanks!

clauniel ( 2015-01-09 04:13:59 -0500 )edit

Glad I could help!

kokirits ( 2015-01-09 04:18:25 -0500 )edit

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