On Jun 21, 2006, at 5:11 PM, Phillip J. Eby wrote:
"""Requirement strings basically consist of a distribution name, an optional list of "options" (more on this in a moment), and a comma- separated list of zero or more version conditions. Version conditions basically specify ranges of valid versions, using comparison operators. The version conditions you supply are sorted into ascending version order, and then scanned left to right until the package's version falls between a pair of > or >= and < or <= conditions, or exactly matches a == or != condition."""
I don't think this is right. :) If I have a collection of eggs like: /home/jim/tmp/dist: used 92 available 41345796 -rw-rw-r-- 1 jim jim 671 Jun 19 17:43 demoneeded-1.0-py2.4.egg -rw-rw-r-- 1 jim jim 672 Jun 19 17:46 demoneeded-1.1-py2.4.egg -rw-rw-r-- 1 jim jim 673 Jun 19 17:46 demoneeded-1.2-py2.4.egg -rw-rw-r-- 1 jim jim 673 Jun 19 17:46 demoneeded-1.3-py2.4.egg -rw-rw-r-- 1 jim jim 673 Jun 19 17:46 demoneeded-1.4-py2.4.egg -rw-rw-r-- 1 jim jim 673 Jun 19 17:46 demoneeded-1.5-py2.4.egg -rw-rw-r-- 1 jim jim 673 Jun 19 17:46 demoneeded-1.6-py2.4.egg -rw-rw-r-- 1 jim jim 673 Jun 19 17:46 demoneeded-1.7-py2.4.egg -rw-rw-r-- 1 jim jim 673 Jun 19 17:46 demoneeded-1.8-py2.4.egg -rw-rw-r-- 1 jim jim 673 Jun 19 17:46 demoneeded-1.9-py2.4.egg Then:
import pkg_resources e = pkg_resources.Environment(['tmp/dist']) ws = pkg_resources.WorkingSet() ws.resolve([pkg_resources.Requirement.parse('demoneeded !=1.1, <1.4')], e) [demoneeded 1.3 (/home/jim/tmp/dist/demoneeded-1.3-py2.4.egg)]
When scanning left to right, 1.9 matches !=1.1, so it should match and, since it is the highest version, it should be returned. Either your description of the algorithm is incorrect or I'm misunderstanding it. Jim -- Jim Fulton mailto:jim@zope.com Python Powered! CTO (540) 361-1714 http://www.python.org Zope Corporation http://www.zope.com http://www.zope.org