Features for a Python package manager?

[Georg Brandl]

Hello c.l.py,

what features would you expect of a Python package manager, similar to
CPAN or rubygems?

I am currently planning to write such a thing, at first privately for
myself, and if it's proving useful, I think about releasing it.

I plan to model it after gentoo's portage, with less features of course.
Would this be acceptable?

feel-free-to-comment-ly yours,
Georg