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Re: Guido on python3 for beginners

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From Matt Wheeler <m@funkyhat.org>
Newsgroups comp.lang.python
Subject Re: Guido on python3 for beginners
Date Thu, 18 Feb 2016 16:44:36 +0000
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On Thu, 18 Feb 2016 11:07 Chris Angelico <rosuav@gmail.com> wrote:

> By the way... For bash users, adding this to .bashrc may make venvs a
> bit easier to keep straight:
>
> checkdir() {
>     [ -n "$VIRTUAL_ENV" ] && ! [[ `pwd` =~ `dirname $VIRTUAL_ENV`* ]]
> && echo Deactivating venv $VIRTUAL_ENV... && deactivate
>     [ -z "$VIRTUAL_ENV" -a -d env ] && echo Activating venv
> `pwd`/env... && source env/bin/activate
> }
> PROMPT_COMMAND=checkdir
>
> (I'm more fluent in Python than in bash, so this is a bit ugly.)
>
> As soon as you change out of the directory that contains your venv,
> it'll be deactivated, so you can't accidentally run stuff in the
> "wrong" environment. And as soon as you change into a directory that
> contains an 'env' subdir, it'll activate it. (Also applies on first
> creation; as soon as "python3 -m venv env" returns, this will activate
> the env.)
>

This is a bad idea for the same reason enabling all magic comments in your
editor is a bad idea.
(rvm does this but confirms that the rvmrc it's about to activate is one
that you've previously approved, I wouldn't want to try to write a shell
function that did that though :)).

>

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    Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Rick Johnson <rantingrickjohnson@gmail.com> - 2016-02-06 12:54 -0800
      Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO INADA Naoki <songofacandy@gmail.com> - 2016-02-07 12:02 +0900
        Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-02-07 16:59 +1100
          Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Paul Rubin <no.email@nospam.invalid> - 2016-02-06 23:04 -0800
            Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Rustom Mody <rustompmody@gmail.com> - 2016-02-06 23:31 -0800
              Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Paul Rubin <no.email@nospam.invalid> - 2016-02-06 23:51 -0800
                Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Chris Angelico <rosuav@gmail.com> - 2016-02-07 18:58 +1100
                Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Jason Swails <jason.swails@gmail.com> - 2016-02-08 10:20 -0500
            Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Christian Gollwitzer <auriocus@gmx.de> - 2016-02-07 08:44 +0100
      Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Chris Angelico <rosuav@gmail.com> - 2016-02-07 14:06 +1100
      Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Ian Kelly <ian.g.kelly@gmail.com> - 2016-02-08 08:40 -0700
      Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Random832 <random832@fastmail.com> - 2016-02-08 10:44 -0500
        Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO wxjmfauth@gmail.com - 2016-02-09 01:15 -0800
      Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Chris Angelico <rosuav@gmail.com> - 2016-02-09 02:46 +1100
      Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Random832 <random832@fastmail.com> - 2016-02-08 10:53 -0500
      Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Chris Warrick <kwpolska@gmail.com> - 2016-02-08 18:48 +0100
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          Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO John Ladasky <john_ladasky@sbcglobal.net> - 2016-02-15 21:24 -0800
            Guido on python3 for beginners Rustom Mody <rustompmody@gmail.com> - 2016-02-17 00:51 -0800
              Re: Guido on python3 for beginners Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-02-18 17:47 +1100
                Re: Guido on python3 for beginners Ben Finney <ben+python@benfinney.id.au> - 2016-02-18 17:57 +1100
                Re: Guido on python3 for beginners Paul Rubin <no.email@nospam.invalid> - 2016-02-17 22:59 -0800
                Re: Guido on python3 for beginners "Sven R. Kunze" <srkunze@mail.de> - 2016-02-18 22:37 +0100
                Re: Guido on python3 for beginners Random832 <random832@fastmail.com> - 2016-02-18 02:00 -0500
                Re: Guido on python3 for beginners Chris Angelico <rosuav@gmail.com> - 2016-02-18 18:27 +1100
                Re: Guido on python3 for beginners John Ladasky <john_ladasky@sbcglobal.net> - 2016-02-18 12:22 -0800
                Re: Guido on python3 for beginners INADA Naoki <songofacandy@gmail.com> - 2016-02-18 17:00 +0900
                Re: Guido on python3 for beginners Terry Reedy <tjreedy@udel.edu> - 2016-02-18 03:40 -0500
                Re: Guido on python3 for beginners Steven D'Aprano <steve@pearwood.info> - 2016-02-20 18:59 +1100
                Re: Guido on python3 for beginners Chris Angelico <rosuav@gmail.com> - 2016-02-18 20:57 +1100
                Re: Guido on python3 for beginners Cem Karan <cfkaran2@gmail.com> - 2016-02-18 05:57 -0500
                Re: Guido on python3 for beginners Chris Angelico <rosuav@gmail.com> - 2016-02-18 22:07 +1100
                Re: Guido on python3 for beginners Rustom Mody <rustompmody@gmail.com> - 2016-02-18 04:25 -0800
                Re: Guido on python3 for beginners Random832 <random832@fastmail.com> - 2016-02-18 10:51 -0500
                Re: Guido on python3 for beginners Steven D'Aprano <steve@pearwood.info> - 2016-02-19 12:17 +1100
                Re: Guido on python3 for beginners Rustom Mody <rustompmody@gmail.com> - 2016-02-18 19:39 -0800
                Re: Guido on python3 for beginners Steven D'Aprano <steve@pearwood.info> - 2016-02-20 13:36 +1100
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                Re: Guido on python3 for beginners Rustom Mody <rustompmody@gmail.com> - 2016-02-18 19:32 -0800
                Re: Guido on python3 for beginners Matt Wheeler <m@funkyhat.org> - 2016-02-18 16:44 +0000
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