[Python-Dev] pkgutil, pkg_resource and Python 3.0 name space packages (original) (raw)

M.-A. Lemburg mal at egenix.com
Mon Jan 7 17:30:45 CET 2008

On 2008-01-07 17:24, Barry Warsaw wrote:

On Jan 7, 2008, at 10:12 AM, Guido van Rossum wrote:

On Jan 7, 2008 6:32 AM, Barry Warsaw <barry at python.org> wrote: On Jan 7, 2008, at 9:01 AM, M.-A. Lemburg wrote:

We could easily resolve that issue, if we add a per-user site-packages dir to sys.path in site.py (this is already done for Macs).

+1. I've advocated that for years. I'm not sure what this buys given that you can do this using PYTHONPATH anyway, but because of that I also can't be against it. +0 from me. Patches for 2.6 gratefully accepted. I think it's PEP-worthy too, just so that the semantics get nailed down. Here's a strawman proto-quasi-pre-PEP. Python automatically adds ~/.python/site-packages to sys.path; this is added /before/ the system site-packages file. An open question is whether it needs to go at the front of the list. It should definitely be searched before the system site-packages. Python treats ~/.python/site-packages the same as the system site-packages, w.r.t. .pth files, etc. Open question: should we add yet another environment variable to control this? It's pretty typical for apps to expose such a thing so that the base directory (e.g. ~/.python) can be moved.

I'd suggest to make the "~/.python" part configurable by an env var, e.g. PYTHONRESOURCES.

Perhaps we could use that directory for other Python-related resources as well, e.g. an optional sys.path lookup cache (pickled dictionary of known package/module file locations to reduces Python startup time).

I think that's all that's needed. It would make playing with easyinstall/setuptools nicer to have this.

-- Marc-Andre Lemburg eGenix.com

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