[Distutils] Metadata 2.0: Is there a formal spec for a requirement?

[Donald Stufft]

Forgot the link: https://packaging.pypa.io/en/latest/version/

> On Sep 16, 2014, at 7:02 AM, Donald Stufft <donald at stufft.io> wrote:
> 
> 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.moore at gmail.com <mailto:p.f.moore at 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.
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> Donald Stufft
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---
Donald Stufft
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