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 <mal@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.python@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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