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Ross Patterson has been working on a branch to speed up zc.buildout. While working on that he noticed that a function (_log_requirement) is performing a lot of computation that is then discarded when the logging level is anything higher than DEBUG. This function is also present in buildout.dumppickedversions and (I finally get to the point ;)) buildout-versions.

Ross fixed this in zc.buildout and in buildout.dumppickedversions and then compared the run time of buildout.dumppickedversions with buildout-versions:

I just timed a production buildout with zc.buildout 1.5.2 and compared
buildout.dumppickedversions 0.5 against buildout-versions 1.7.

    buildout.dumppickedversions 0.5 = 0m33.449s
    buildout-versions 1.7           = 1m11.667s

He asked me (in private mail) to ping you, since I brought buildout-versions up in the discussion, and he doesn't use it personally, so I'm pinging you. ;)

I'll try to create a github pull request soon.

Using buildout 1.5.2, when site-packages are allowed, I've noticed that buildout-versions doesn't pick up any of the dependencies found in site-packages.

I have not delved deep in to buildout-extensions, but why can buildout.dumppickedversions be used with zc.buildout v1.4.*
while buildout-versions requires 1.5.0?

is it doable to add compatibility for zc.buildout v1.4.*?

When cleaning up code and removing dependencies you all too easily end up with lots of unused version pins. It would be nice of buildout-versions could list those.