http://lwn.net/Articles/571528/ https://fedoraproject.org/wiki/Changes/Python_3_as_Default http://www.python.org/dev/peps/pep-0394/
>>>>>> * python2 will refer to some version of Python 2.x. * python3 will refer to some version of Python 3.x. * for the time being, all distributions should ensure that python refers to the same target as python2. * however, end users should be aware that python refers to python3 on at least Arch Linux (that change is what prompted the creation of this PEP), so python should be used in the shebang line only for scripts that are source compatible with both Python 2 and 3. * in preparation for an eventual change in the default version of Python, Python 2 only scripts should either be updated to be source compatible with Python 3 or else to use python2 in the shebang line. <<<<<<<<<<< So configure using '#!/usr/bin/env python' should be fine for a while - and at some point it can be switched to '#!/usr/bin/env python2' if needed. Satish