Re: Question about (properties `((python2-variant . ,(delay XXX)))) and name resolution

[Danny Milosavljevic]

Hi Leo,

On Tue, 19 Jul 2016 23:58:23 -0400
Leo Famulari <address@hidden> wrote:

> In this case, it looks like the Python 2 variant of the package is the
> same as the Python 3 variant, aside from the Python version. So, you
> should be able to drop the (properties `((python2-variant ...) line from
> the python-ptpython package.

I tried that, but I still can't do

  $ guix package -i ptpython-2

because:

  guix package: error: ptpython: package not found for version 2

.

I've since settled on

 (define-public ptpython-2
  (let ((base (package-with-python2 (strip-python2-variant ptpython))))
    (package
      (inherit base)
      (name "ptpython-2"))))

... which does work. On second thought the package-with-python2 probably can't 
recognize the name otherwise.

Now, the ptpython executables are still called the same - so you can't install 
ptpython and ptpython-2 at the same time.

> I hope that helps!

Yup, thanks!