Specifiers are defined in PEP 440 (the >=1.0 parts), however PEP 426 combines those with the package names to get “foo >=1.0”. The packaging library implements the specifier part.
> On Sep 16, 2014, at 6:59 AM, Paul Moore <p.f.mo...@gmail.com> wrote: > > I feel as though I must be missing something obvious, but is there an > actual specification of the syntax and semantics of a requirement > anywhere? I've scanned through the PEP, and while there is a spec for > the environment marker mini-language, there isn't one for a > requirement. (As a check I hadn't missed anything obvious, I did a > text search for the operator ">=" which *is* a valid operator in a > requirement, and it's not present in a syntax definition or anything > equivalent. > > I ask because I'm looking for a way to find a way of matching a set of > package/version details against a requirement, and I was coming up > blank. So I was going to write my own, and then I found that there's > no spec :-( > > Surely having a spec for a requirement has to be part of the sign-off > requirements for Metadata 2.0? > > Digging a bit further, there is (of course, doh!) the pkg_resources > requirement parser. But even if that is definitive, I think it should > be integrated into the Metadata 2.0 spec, or at the very least > referenced from there (and just having a reference risks the > possibility of setuptools accidentally making changes outside of the > PEP process). > > Paul > > [1] Pip's code is too complex to factor out the bits I want, and > distlib's version matcher seems to support a different syntax if the > docs are correct. > _______________________________________________ > Distutils-SIG maillist - Distutils-SIG@python.org > https://mail.python.org/mailman/listinfo/distutils-sig --- Donald Stufft PGP: 7C6B 7C5D 5E2B 6356 A926 F04F 6E3C BCE9 3372 DCFA
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