2011-03-01 22:50:34 Kerrick Staley napisał(a): > On Tue, Mar 1, 2011 at 3:26 PM, Eric Smith <e...@trueblade.com> wrote: > > On 3/1/2011 4:19 PM, Kerrick Staley wrote: > >> Hello, > >> There is a need for the default Python2 install to place a symlink at > >> /usr/bin/python2 that points to /usr/bin/python, or for the > >> documentation to recommend that packagers ensure that python2 is > >> defined. Also, all documentation should be changed to recommend that > >> "#!/usr/bin/env python2" be used as the shebang for Python 2 scripts. > >> This is needed because some distributions (Arch Linux, in particular), > >> point /usr/bin/python to /usr/bin/python3, while others (including > >> Slackware, Debian, and the BSDs, probably more) do not even define the > >> python2 command. This means that a script has no way of achieving > >> cross-platform compatibility. The point at which many distributions > >> begin to alias /usr/bin/python to /usr/bin/python3 is due soon, and for > >> the next couple of years, it would be best to use a python2 or python3 > >> shebang in all scripts, making no assumptions about plain python, which > >> should only be invoked interactively. This email from about 3 years ago > >> seems relevant: : > >> http://mail.python.org/pipermail/python-3000/2008-March/012421.html > >> Again, this issue needs to be addressed by the Python developers > >> themselves so that different *nix distributions will handle it > >> consistently, allowing Python scripts to continue to be cross-platform. > >> > >> > > I believe we agreed at the language summit last year (or maybe even the > > year before) that "python" would always be python2.x, and "python3" would be > > python3.x. > > > > And by "always" we indeed meant forever. To do otherwise would break > > scripts even many, many years from now. > > I understand, but is it at least possible to officially recommend that > python, python2, and python3 all exist, that distributions point python to > python2, and that scripts specify which of python2 and python3 they are > using? This would create a redundant system that doesn't avoids problems > even if distributions do decide to ignore the second point. If not, can > someone point me to official documentation that recommends that python > always invoke Python2, so that I can take the case up with the Arch > developers?
Gentoo most likely will switch /usr/bin/python to Python 3 in this year. Majority of Python-2-only packages have been already prepared to use /usr/bin/python2 or /usr/bin/python2.X. -- Arfrever Frehtes Taifersar Arahesis
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