[ros-users] Does ROS follow python PEP 0394?

As I'm sorting out how to get ROS working well with Archlinux, one of
the main issues is that 'python' is linked to python3 in arch.

There is a PEP addressing this issue in general
http://www.python.org/dev/peps/pep-0394/ which in short recommends that
python should be called via python2 or python3 unless the code is
compatible with both.