From mboxrd@z Thu Jan  1 00:00:00 1970
From: Leo Famulari <leo@famulari.name>
Subject: Re: [PATCH 2/7] gnu: add python-sqlparse and python2-sqlparse
Date: Mon, 18 Apr 2016 16:23:46 -0400
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To: Hartmut Goebel <h.goebel@crazy-compilers.com>
Cc: guix-devel@gnu.org

On Sun, Apr 17, 2016 at 10:50:52PM +0200, Hartmut Goebel wrote:
> * gnu/packages/python.scm (python-sqlparse) (python2-sqlparse):
>   New functions.

[...]

> +    (build-system python-build-system)
> +    (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)

Is this running the python3 interpreter with no arguments in order to
see if it exists, and then doing 2to3 if it does?