On Thu, Sep 1, 2016 at 8:04 AM, Avram Lubkin <av...@rockhopper.net> wrote: > > On Thu, Sep 1, 2016 at 7:44 AM, Nick Coghlan <ncogh...@gmail.com> wrote: >> >> >> The ideal point we'd like to get to is one where all distro provided >> scripts actually have the appropriate major version in their shebang >> lines, and the unqualifed "python" is something along the lines of a >> user-configurable launcher, akin to the "py" launcher for Windows: >> https://docs.python.org/3/using/windows.html#python-launcher-for-windows >> (see https://www.python.org/dev/peps/pep-0397/ for more details on >> that) > > > While I see some benefit to something like this and could see use cases for > including it in the shebang, it would be overkill for "/usr/bin/python". > Windows needs something like that because it doesn't support symlinks. > > Let's stop trying to reinvent the wheel. There is already a system for > handling this, alternatives, which is used by other languages and included > in a minimal Fedora install. It would only require adding to the %post and > %postun scripts in the spec file and allows very easy testing to see what > breaks when changing the default. When we are ready to change the default, > only one value needs to be changed. And most importantly, it gives the > end-user an easy way to change their system-wide default either from python > 2 to 3 or when running a pre-release version of 3.x in parallel. >
Alternatives doesn't work in this case because Python 2.x and Python 3.x versions don't share resources, even with minor versions of the same series. Enabling alternatives for it is a recipe for disaster. -- 真実はいつも一つ！/ Always, there's only one truth! _______________________________________________ python-devel mailing list python-devel@lists.fedoraproject.org https://lists.fedoraproject.org/admin/lists/python-devel@lists.fedoraproject.org
