Re: MBF for deprecating Python2 usage
Ole Streicher wrote:
> It is very usual to use "#!/usr/bin/env python" as shebang, exactly for
> the case that python is not installed in /usr/bin.
Sure, but then all bets are off. The script so shebanged can't assume
anything about $PATH so it gets whatever it gets. Using /usr/bin/env in
system provided scripts has been known to break stuff, so it's a very
bad idea.
Plus, if that's what you use for your own scripts, then in the future
you'll be in luck because all you'd have to do is change your $PATH
to point to wherever your custom built and installed Python 2 lives
first, and then you'll get exactly the version you want.
> That is -- at least in my environmet -- "ipython", or (for Python 3)
> "ipython3".
>
> IMO it would be better to communicate that the best way for an
> interactive session is "ipython3" (or "python3", if you insist). I would
> wonder when todays tutorials (that cover Python 3) recommend to use
> plain "python".
But ipython doesn't come with upstream Python so that would require that
Something Extra be installed. That's generally why Getting Started
guides and tutorials usually recommend the built-in interactive prompt.
>> * Port as much as possible to Python 3 (eventually, everything
>> maintained in Debian) and /usr/bin/python3 in their shebang.
> I disagree here, and I don't see an advantage over letting
> /usr/bin/python just die with Python 2.
/usr/bin/python didn't die with Python 2 (who else remembers 1.5.2 as an
effectively LTS release? :) and I don't believe it should with Python 3.
Maybe go on vacation, but eventually return home.
> I would also like to point PEP 394, which has a number of arguments why
> /usr/bin/python should remain as Python 2.
>
> https://www.python.org/dev/peps/pep-0394/
Right, but the ecosystem has evolved since then, so the discussions
going on in linux-sig and the *draft* PR at
https://github.com/python/peps/pull/315 are about updating the
recommendations now that we're somewhere less than three years away from
Python 2 EOL.
Fedora is moving forward with or without us. I bet that other Linux
distros will too. We can certainly do our own thing, but I think
that'll make Debian the odd distro out eventually.
Cheers,
-Barry
Reply to: