[Python-ideas] module version number support for semver.org

[Nick Coghlan]

On 15 Apr 2014 00:42, "Terry Reedy" <tjreedy at udel.edu> wrote:
>
> On 4/14/2014 11:51 AM, Jörn Hees wrote:
>
>> what do you think about officially supporting Semantic Versioning?
>> ( http://semver.org )
>
>
>> Key differences
>> ===============
>
>
> There are two types of differences. First are the syntax differences,
which you discuss and illustrate. The top-level x.y.z syntax of semver is
compatible with PEP440. The incompatibilites come in the postfix tags, and
in particular, the use of '.' versus '-' following 'z'.
>
> Second are the semantic differences, which you did not discuss. PEP 440
does not prescribe a meaning for major, minor, micro(patch) numbers. Semver
does. As I read semver.org, semver syntax without semver semantics is not
Semantic Versioning. So officially supporting Semantic Versioning should
mean adopting the semantics. Indeed, a project could use semver semantics
for x.y.z while using PEP 440 syntax for postfix tags.
>
> For Python, the semantics would require that each Python version get a
new major number, and that the minor number might always be 0. I don't see
that as useful. Semantic semver would only be practical on a module by
module basis (or in some cases, packages).

PEP 440 uses semantic versioning semantics by default unless a project
appears to be using date based versions, or the consumer specifies a
different comparison operator.

The only real discrepancy is the postfix syntax, and that's due to the
unordered nature of semver build labels.

Cheers,
Nick.

>
> As I said in response to this same post on python-list, one problem with
mechanical semantic interpretation of version numbers, the supposed
justification for the system, is that such interpretation does not work as
soon as one accidentally makes a release that violates the semantic rules.
>
> --
> Terry Jan Reedy
>
>
>
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