Nick Coghlan wrote: > Guido van Rossum wrote: >> On Wed, Jan 13, 2010 at 9:57 AM, sstein...@gmail.com > Or, how about >> just removing the antiquated use of environment variables altogether >> from Python 3 and avoid the issue completely. >> >> -1. They have their use, but more in controlled situations. If you >> have "global" env vars that you only want to use with Python 2.x, >> write a wrapper for Python 3 that invokes it with -E. > > Perhaps a case can be made for Python 3 to assume -E by default, with a > -e option to enable reading of the environment variables? > > That way naive users could run Python3 without tripping over existing > Python2 environment variables, while other tools could readily set up a > different environment before launching Python3.
Naive users won't have PYTHONPATH or any other Python environment variables setup. Really, if you know that you are going to run Python 3 instead of Python 2 or vice-versa it's easy enough to run . py3env.sh or . py2env.sh in order to setup your shell environment, much like you typically do when using virtual Python installations or work on different projects that require different setups. If you just want to separate Python 2 and 3 files, use the user site-packages dir which includes the Python version. More experienced users could also write their own environment switching sitecustomize.py or usercustomize.py. And then there's the hackery option for experts that love dirty tricks: add a .pth file which includes an "import mysetup" line to fix-up you path and other settings. -- Marc-Andre Lemburg eGenix.com Professional Python Services directly from the Source (#1, Jan 14 2010) >>> Python/Zope Consulting and Support ... http://www.egenix.com/ >>> mxODBC.Zope.Database.Adapter ... http://zope.egenix.com/ >>> mxODBC, mxDateTime, mxTextTools ... http://python.egenix.com/ ________________________________________________________________________ ::: Try our new mxODBC.Connect Python Database Interface for free ! :::: eGenix.com Software, Skills and Services GmbH Pastor-Loeh-Str.48 D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg Registered at Amtsgericht Duesseldorf: HRB 46611 http://www.egenix.com/company/contact/ _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
