Comment #3 on issue 2673 by asmeurer: Improve the use2to3 script http://code.google.com/p/sympy/issues/detail?id=2673
So I asked on the python-porting list about using python3 in shebang lines. See http://mail.python.org/pipermail/python-porting/2011-September/000231.html and in particular the response from Barry Warsaw (http://mail.python.org/pipermail/python-porting/2011-September/000241.html). Apparently there is a draft PEP 394 (http://www.python.org/dev/peps/pep-0394/), which is likely to be accepted, that says that "python3" should point to Python 3 on *nix systems. So we should definitely just use "/usr/bin/env python3" in all Python 3 scripts, both for development and release versions. There's also some good rationales for this in the PEP.
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