I know nothing of the details, but I think the goal is to have the same
command work (almost) everywhere, yes?
That does not need to be a python script, however. In fact, it's nice if
activating an environment is as fast as possible so firing up Python to do
it is less than ideal.
Anyway -- I'd encourage folks to look at conda -- it now provides a conda
command that can activate on multiple plaatfroms the same way:
conda activate env_name
I don't know how many different shells that works with, but it at least
hits the big few.
"conda" used to be a python script but I'm pretty sure it's now some kind
of custom executable that re-directs the commands, and I'm sure is
different on different platforms.
prior art and all that.
-CHB
On Mon, Jan 4, 2021 at 8:34 AM M.-A. Lemburg <m...@egenix.com> wrote:
> On 04.01.2021 15:45, Chris Angelico wrote:
> > On Tue, Jan 5, 2021 at 1:42 AM Abdur-Rahmaan Janhangeer
> > <arj.pyt...@gmail.com> wrote:
> >>
> >> Greetings list,
> >>
> >> put simply,
> >>
> >> be able to use
> >>
> >> $ python -m venv venv_name activate
> >>
> >> To activate an env instead of having each platform have a way of
> >> handling it
> >>
> >
> > Unfortunately, that wouldn't work. Activating a virtual environment
> > means setting some env vars in the current shell, and Python is
> > fundamentally unable to do that - it can only be done within the shell
> > itself (by sourcing a script).
> >
> > You can, of course, simply run the Python executable from that venv,
> > but activation is *by its nature* a shell feature, and will differ by
> > shell.
>
> Something that would work is using the ssh-agent approach to
> output shell commands which configure the environment:
>
> # For bash et al:
> `python3 -c "print('export TEST=1')"`
>
> A new command:
>
> `python3 -m venv activate myenv bash`
>
> could do the trick.
>
> Of course, venv itself could also create the necessary
> shell files in the bin/ dir. You'd then just need to
> run:
>
> source myenv/bin/activate.sh
>
> (this is how virtualenv does this)
>
> --
> Marc-Andre Lemburg
> eGenix.com
>
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