Re: [gentoo-dev] Re: PYTHON_DEPEND - Suggested replacement for NEED_PYTHON

[Fabian Groffen]

On 11-01-2010 08:29:32 +0000, Duncan wrote:
> Fabian Groffen posted on Mon, 11 Jan 2010 08:50:30 +0100 as excerpted:
>
> > On 11-01-2010 01:25:45 +0100, Arfrever Frehtes Taifersar Arahesis wrote:
> >> > Can you explain the intended use of this variable, and why normal
> >> > DEPEND is not sufficient?
> >>
> >> PYTHON_DEPEND is intented to simplify specification of dependency on
> >> Python.
> >>
> >> PYTHON_DEPEND="2:2.5" is shorter than: DEPEND="|| (
> >> =dev-lang/python-2.7* =dev-lang/python-2.6* =dev-lang/python-2.5* )"
> >
> > So if there is enough space to express the dependency with the current
> > syntax, is it worth introducing a new shorthand for it then?
> >
> > Also for this example, why does 2:2.5 expand to 2.7, 2.6 and 2.5?  I
> > would have expected 2.0 ... 2.5.  Maybe the language isn't as intuitive
> > then as Sebastian pointed out.
>
> Initially intuitive, perhaps not, but reasonably easy after reading the
> explanation:
>
> The first position is major python version, the second if present,
> minimal version (within that major), so it can be read as =>version, the
> third if present, maximum version (within that major), so it can be read
> as <=.
>
> Thus, the above "2:2.5" means major version 2, minimal version 2.5 (no
> maximum version within that major), so 2.5+.

what's wrong with ">=2.5 && <3.0" then?


-- 
Fabian Groffen
Gentoo on a different level