On 01/03/2011 21:19, 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.
+1
Note that a PEP will need to address what we do for Windows and Mac OS
X. Less of an issue for Windows where we don't put python.exe on the
PATH (which we *should*), but we still need to decide whether we will
add python2 / python3 binaries.
Michael Foord
Thanks,
Kerrick Staley
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