* Scott Kitterman <[email protected]>, 2012-03-17, 14:29:
Upon reflection, this could be better stated something like this:
"The generated minumum dependency may be different than the lowest
version currently supported. In such cases, X-Python-Version must
still be specified if the generated dependency is not sufficient."
To give a specific example, even though python3.2 is the only supported
python3, for an arch all module, dh_python3 will generate a dependency
of python3 >= 3.1.3-13. If the upstream code requires 3.2, then you
still need to specify (in this example) X-Python3-Version.
This is true, but I'm not sure why Python Policy needs to talk about
this. If it does, then probably appendix B would be the correct place.
Or a footnote.
In general, how X(S)P(3)V is translated to dependency on python(3)
varies depending on which helper you use. A packaging helper can add a
dependency on "python(3) (>= $V)" for several reasons:
1) because the package declared "X(S)P(3)V: >= $V" [all helpers];
2) because the package ships extension modules (or other files that
cannot be shared across versions) only for versions >= $V [all helpers];
3) because the helper is implemented in such a way that it supports at
runtime only (a subset of) versions available at buildtime [dh_python2,
and sometimes python-central];
4) because it generates maintainer scripts that need such version of
python(3) [dh_python2, dh_python3].
--
Jakub Wilk
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