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Re: Python 2 to 3 conversion - embrace the pain

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Date Mon, 16 Mar 2015 20:14:20 -0600
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Subject Re: Python 2 to 3 conversion - embrace the pain
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On 03/16/2015 02:36 PM, Steven D'Aprano wrote:
> I'm sorry, that makes no sense to me. What does it matter whether Python3 is
> installed to /opt or /usr or /bin or /who/the/feck/cares, so long as your
> application runs when you run it? It's just another dependency, and no more
> than one call to yum away.

Of course it matters.  How else will you refer to it in the #!
invocation?  If Python3 is in the system path then you can use a wrapper
script like Calibre does.  But in the case of RHEL with Software
Collections (which does use yum), it does not place it in the system path.

> Yesterday I wrote:
> 
>     Alas, too many (Linux) developers insist on using the system Python
>     as their application language. In most cases they could trivially
>     run "aptitude install python3" and be done with it, but that's an 
>     extra dependency and therefore Bad.
> 
> I never imagined that anyone would argue that they can't install and use
> Python3 because of the location where it is installed. As an application
> developer, apart from ensuring that the PATH is setup correctly and maybe
> having to adjust a few hash-bang lines, how does the location of the Python
> binary affect you?

Well the thing is that it's *not* in the PATH by default.  So it does
affect me. The official way to use Python 3 in RHEL Software Collection
is to invoke with with this command line:

scl enable python33 bash

This gives you a shell where python3 is in the path.  You can put
Python3 in the path permanently by modifying /etc/profile.  There are
good reasons for SCL doing things this way, and it's not the only way.
Just pointing out that distro life isn't always rosy.

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Thread

Re: Python 2 to 3 conversion - embrace the pain Chris Angelico <rosuav@gmail.com> - 2015-03-16 14:22 +1100
  Re: Python 2 to 3 conversion - embrace the pain Paul Rubin <no.email@nospam.invalid> - 2015-03-15 22:07 -0700
    Re: Python 2 to 3 conversion - embrace the pain Chris Angelico <rosuav@gmail.com> - 2015-03-16 16:39 +1100
      Re: Python 2 to 3 conversion - embrace the pain Paul Rubin <no.email@nospam.invalid> - 2015-03-15 23:17 -0700
        Re: Python 2 to 3 conversion - embrace the pain Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-16 19:00 +1100
          Re: Python 2 to 3 conversion - embrace the pain Paul Rubin <no.email@nospam.invalid> - 2015-03-16 01:31 -0700
            Re: Python 2 to 3 conversion - embrace the pain Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-17 00:05 +1100
              Re: Python 2 to 3 conversion - embrace the pain Chris Angelico <rosuav@gmail.com> - 2015-03-17 00:29 +1100
            Re: Python 2 to 3 conversion - embrace the pain Terry Reedy <tjreedy@udel.edu> - 2015-03-16 13:59 -0400
      Re: Python 2 to 3 conversion - embrace the pain Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-16 18:56 +1100
        Re: Python 2 to 3 conversion - embrace the pain Paul Rubin <no.email@nospam.invalid> - 2015-03-16 01:25 -0700
          Re: Python 2 to 3 conversion - embrace the pain INADA Naoki <songofacandy@gmail.com> - 2015-03-16 18:13 +0900
            Re: Python 2 to 3 conversion - embrace the pain Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-16 22:55 +1100
          Re: Python 2 to 3 conversion - embrace the pain Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-17 01:25 +1100
            Re: Python 2 to 3 conversion - embrace the pain Paul Rubin <no.email@nospam.invalid> - 2015-03-16 15:36 -0700
              Re: Python 2 to 3 conversion - embrace the pain Terry Reedy <tjreedy@udel.edu> - 2015-03-16 22:28 -0400
                Re: Python 2 to 3 conversion - embrace the pain wxjmfauth@gmail.com - 2015-03-17 01:31 -0700
              Re: Python 2 to 3 conversion - embrace the pain Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-17 22:26 +1100
                Re: Python 2 to 3 conversion - embrace the pain wxjmfauth@gmail.com - 2015-03-17 07:03 -0700
                Re: Python 2 to 3 conversion - embrace the pain Mario Figueiredo <marfig@gmail.com> - 2015-03-17 15:35 +0100
                Re: Python 2 to 3 conversion - embrace the pain Paul Rubin <no.email@nospam.invalid> - 2015-03-19 16:23 -0700
                Re: Python 2 to 3 conversion - embrace the pain Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2015-03-19 22:03 -0400
                Re: Python 2 to 3 conversion - embrace the pain Mario Figueiredo <marfig@gmail.com> - 2015-03-20 03:54 +0100
          Re: Python 2 to 3 conversion - embrace the pain Michael Torrie <torriem@gmail.com> - 2015-03-16 11:20 -0600
            Re: Python 2 to 3 conversion - embrace the pain Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-17 07:36 +1100
              Re: Python 2 to 3 conversion - embrace the pain Michael Torrie <torriem@gmail.com> - 2015-03-16 20:14 -0600
              Re: Python 2 to 3 conversion - embrace the pain Cameron Simpson <cs@zip.com.au> - 2015-03-17 17:47 +1100
          Re: Python 2 to 3 conversion - embrace the pain Terry Reedy <tjreedy@udel.edu> - 2015-03-16 13:47 -0400
          Re: Python 2 to 3 conversion - embrace the pain Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-03-16 18:14 +0000
          Re: Python 2 to 3 conversion - embrace the pain INADA Naoki <songofacandy@gmail.com> - 2015-03-17 04:41 +0900
          Re: Python 2 to 3 conversion - embrace the pain Chris Angelico <rosuav@gmail.com> - 2015-03-17 09:02 +1100
            Re: Python 2 to 3 conversion - embrace the pain Mario Figueiredo <marfig@gmail.com> - 2015-03-17 04:04 +0100
              Re: Python 2 to 3 conversion - embrace the pain Michael Torrie <torriem@gmail.com> - 2015-03-16 21:33 -0600
                Re: Python 2 to 3 conversion - embrace the pain Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-17 19:36 +1100
              Re: Python 2 to 3 conversion - embrace the pain Ben Finney <ben+python@benfinney.id.au> - 2015-03-17 14:42 +1100
                Re: Python 2 to 3 conversion - embrace the pain Mario Figueiredo <marfig@gmail.com> - 2015-03-17 05:30 +0100
                Re: Python 2 to 3 conversion - embrace the pain Cameron Simpson <cs@zip.com.au> - 2015-03-18 08:53 +1100
              Re: Python 2 to 3 conversion - embrace the pain Chris Angelico <rosuav@gmail.com> - 2015-03-17 14:49 +1100
                Re: Python 2 to 3 conversion - embrace the pain Mario Figueiredo <marfig@gmail.com> - 2015-03-17 05:26 +0100
                Re: Python 2 to 3 conversion - embrace the pain Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-03-17 04:36 +0000
                Re: Python 2 to 3 conversion - embrace the pain Grant Edwards <invalid@invalid.invalid> - 2015-03-17 14:50 +0000
                Re: Python 2 to 3 conversion - embrace the pain wxjmfauth@gmail.com - 2015-03-17 08:15 -0700
                Re: Python 2 to 3 conversion - embrace the pain Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2015-03-17 18:36 -0400
                Re: Python 2 to 3 conversion - embrace the pain Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-03-17 22:41 +0000
                Re: Python 2 to 3 conversion - embrace the pain Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2015-03-18 08:04 -0400
                Re: Python 2 to 3 conversion - embrace the pain Mario Figueiredo <marfig@gmail.com> - 2015-03-18 02:02 +0100
          [OT] Weaknesses of distro package managers - was Re: Python 2 to 3 conversion - embrace the pain Michael Torrie <torriem@gmail.com> - 2015-03-16 19:46 -0600
            Re: [OT] Weaknesses of distro package managers - was Re: Python 2 to 3 conversion - embrace the pain Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-17 19:39 +1100
              Re: [OT] Weaknesses of distro package managers - was Re: Python 2 to 3 conversion - embrace the pain Michael Torrie <torriem@gmail.com> - 2015-03-17 09:02 -0600
            Re: [OT] Weaknesses of distro package managers - was Re: Python 2 to 3 conversion - embrace the pain Michael Torrie <torriem@gmail.com> - 2015-03-19 16:37 -0600
              Re: [OT] Weaknesses of distro package managers - was Re: Python 2 to 3 conversion - embrace the pain wxjmfauth@gmail.com - 2015-03-20 02:40 -0700
                Re: [OT] Weaknesses of distro package managers - was Re: Python 2 to 3 conversion - embrace the pain Mario Figueiredo <marfig@gmail.com> - 2015-03-20 15:59 +0100
                Re: [OT] Weaknesses of distro package managers - was Re: Python 2 to 3 conversion - embrace the pain Mario Figueiredo <marfig@gmail.com> - 2015-03-20 16:03 +0100
                Re: [OT] Weaknesses of distro package managers - was Re: Python 2 to 3 conversion - embrace the pain Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-03-20 15:42 +0000
                Re: [OT] Weaknesses of distro package managers - was Re: Python 2 to 3 conversion - embrace the pain Chris Angelico <rosuav@gmail.com> - 2015-03-21 04:13 +1100
                Re: [OT] Weaknesses of distro package managers - was Re: Python 2 to 3 conversion - embrace the pain wxjmfauth@gmail.com - 2015-03-20 12:21 -0700
          Re: [OT] Weaknesses of distro package managers - was Re: Python 2 to 3 conversion - embrace the pain Chris Angelico <rosuav@gmail.com> - 2015-03-17 12:57 +1100
            Re: [OT] Weaknesses of distro package managers - was Re: Python 2 to 3 conversion - embrace the pain Paul Rubin <no.email@nospam.invalid> - 2015-03-16 19:45 -0700
              Re: [OT] Weaknesses of distro package managers - was Re: Python 2 to 3 conversion - embrace the pain Michael Torrie <torriem@gmail.com> - 2015-03-16 21:05 -0600
          Re: [OT] Weaknesses of distro package managers - was Re: Python 2 to 3 conversion - embrace the pain Michael Torrie <torriem@gmail.com> - 2015-03-16 20:07 -0600
          Re: Python 2 to 3 conversion - embrace the pain Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-03-17 02:21 +0000
          Re: [OT] Weaknesses of distro package managers - was Re: Python 2 to 3 conversion - embrace the pain Ben Finney <ben+python@benfinney.id.au> - 2015-03-17 13:40 +1100
            Package manager cooperation? (was Weaknesses of distro package managers) Rustom Mody <rustompmody@gmail.com> - 2015-03-16 20:09 -0700
              Re: Package manager cooperation? (was Weaknesses of distro package managers) Michael Torrie <torriem@gmail.com> - 2015-03-16 21:32 -0600
              Re: Package manager cooperation? (was Weaknesses of distro package managers) Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-03-17 04:03 +0000
              Re: Package manager cooperation? (was Weaknesses of distro package managers) Chris Angelico <rosuav@gmail.com> - 2015-03-17 15:18 +1100
                Re: Package manager cooperation? (was Weaknesses of distro package managers) wxjmfauth@gmail.com - 2015-03-17 01:44 -0700
          Re: [OT] Weaknesses of distro package managers - was Re: Python 2 to 3 conversion - embrace the pain Michael Torrie <torriem@gmail.com> - 2015-03-16 20:51 -0600
          Re: [OT] Weaknesses of distro package managers - was Re: Python 2 to 3 conversion - embrace the pain Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-03-17 03:01 +0000
          Re: [OT] Weaknesses of distro package managers - was Re: Python 2 to 3 conversion - embrace the pain Michael Torrie <torriem@gmail.com> - 2015-03-16 21:05 -0600
            Re: [OT] Weaknesses of distro package managers - was Re: Python 2 to 3 conversion - embrace the pain Mario Figueiredo <marfig@gmail.com> - 2015-03-17 04:07 +0100
          Re: [OT] Weaknesses of distro package managers - was Re: Python 2 to 3 conversion - embrace the pain Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-03-17 03:17 +0000
          Re: [OT] Weaknesses of distro package managers - was Re: Python 2 to 3 conversion - embrace the pain Alexander <xr.lists@gmail.com> - 2015-03-17 16:44 +1300
        Re: Python 2 to 3 conversion - embrace the pain Chris Angelico <rosuav@gmail.com> - 2015-03-16 19:51 +1100
    Re: Python 2 to 3 conversion - embrace the pain Terry Reedy <tjreedy@udel.edu> - 2015-03-16 04:53 -0400
      Re: Python 2 to 3 conversion - embrace the pain Paul Rubin <no.email@nospam.invalid> - 2015-03-16 02:27 -0700

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