[Python-Dev] PEP 8 updates/clarifications

[Barry Warsaw]

On Tue, 2005-12-13 at 12:00 -0500, Phillip J. Eby wrote:

> In any case, the algorithms involved are near-trivial; the most complex 
> piece is the processing of complex version specifications like 
> "CherryPy>=2.1.0,!=2.1.1-rc2,<2.2a" into a series of version intervals.
> 
> The only outstanding feature request for the dependency resolution 
> algorithm is supporting optional or replaceable dependencies such as "we 
> need either scipy *or* Numeric".

You might look at Gentoo's portage system and its package dependencies
for a model here.  I think they have a notion of "virtual" packages,
such as "mta" or "X" which various specific packages such as sendmail,
postfix, X11 or xorg can fulfill.

-Barry

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