On 15 November 2017 at 19:51, Paul Moore <p.f.mo...@gmail.com> wrote:
> On 15 November 2017 at 08:22, Nick Coghlan <ncogh...@gmail.com> wrote: > > On 15 November 2017 at 16:13, Steve Barnes <gadgetst...@live.co.uk> > wrote: > >> > >> - "pip -X[.Y][-32|-64] operation ..." tries to find a python matching > >> -X[.Y][-32|-64] and if it succeeds executes "python -m pip operation > >> ..." with that python, (if it doesn't find a matching python is should > >> fail with a sensible error message and possibly list the valid python > >> specifiers). > > > > > > This is a genuinely interesting option, especially as `pipenv` has > already > > implemented a feature somewhat akin to this: > > https://docs.pipenv.org/basics.html#specifying-versions-of-python > > > > `pipenv` also allows `pipenv --two` and `pipenv --three` when setting up > > your initial virtual environment. > > This is an interesting idea for *any* tool that's about "working with > Python environments" as opposed to "writing Python code". So pip, > virtualenv, tox, pipenv, ... Many of these tools are variously > reinventing "tell me which Python environment to work on" options. > Having a common way to do this would be really useful. I'm not sure > how likely it would be for pip to be able to use it (pip introspects > sys.executable to get site-packages, etc), but it's certainly a > possibility. > > Having a standardised library/wrapper that handles the "select a > Python environment" process would be a huge plus. There's > https://github.com/zooba/pep514tools which is a start on handling the > Windows registry scanning logic, and building on that to include Unix > and anything else we needed would be great. > While I suspect pep514tools itself may not end up being the right place, I filed https://github.com/zooba/pep514tools/issues/2 to start discussing that idea further. For other platforms, just naively scanning `PATH` is often good enough, so it's mainly Windows where discovery needs to be a bit more aware of platform specific details (i.e. PEP 514's registry entries). Cheers, Nick. -- Nick Coghlan | ncogh...@gmail.com | Brisbane, Australia
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