Re: Branching based on Python version (was [PATCH 2/6] gnu: add python-sqlparse and python2-sqlparse)

[Leo Famulari <leo@famulari.name>]

On Sun, Apr 24, 2016 at 11:40:29PM +0200, Ludovic Courtès wrote:
> Leo Famulari <leo@famulari.name> skribis:
> 
> > On Thu, Apr 21, 2016 at 09:19:49PM +0200, Hartmut Goebel wrote:
> >> * gnu/packages/python.scm (python-sqlparse) (python2-sqlparse):
> >>   New variables.
> >
> >> +    (arguments
> >> +     `(#:phases
> >> +       (modify-phases %standard-phases
> >> +         (replace 'check
> >> +           (lambda* _
> >> +             ;; setup.py-integrated 2to3 only affects the build files, but
> >> +             ;; py.test is using the source files. So we need to convert them
> >> +             ;; manually.
> >> +             (if (zero? (system* "python3"))
> >> +                 (system* "2to3" "--no-diff" "-wn" "sqlparse" "tests")
> >> +                 #t)
> >> +             (zero? (system* "py.test")))))))
> >
> > I think there must be a better way to do this conditional, but I'm not
> > sure what it is. Does anyone have any ideas?
> 
> (guix build python-build-system) includes ‘get-python-version’, which
> could be used for this purpose.
> 
> But I think the above is acceptable here (I’d use ‘when’ instead of the
> one-armed ‘if’, but that’s purely cosmetic.)

Okay, sounds good.

Hartmut, can you change it to use 'when' when you submit your revisions
to python-selenium and python-geoip2?

> 
> Thanks,
> Ludo’.