guix: python: Add package-with-python2, a procedure rewriting a package

  to compile with Python 2 instead of the default Python 3.

* guix/build-system/python.scm (default-python2, package-with-explicit-python,
    package-with-python2): New procedures.
* guix/build-system/python.scm (python2-pytz, python2-babel): Use
    package-with-python2.

1 files changed, 3 insertions, 8 deletions

diff --git a/gnu/packages/python.scm b/gnu/packages/python.scm
index ce89281e26..3ff4da2149 100644
--- a/gnu/packages/python.scm
+++ b/gnu/packages/python.scm
@@ -28,6 +28,7 @@
   #:use-module (gnu packages patchelf)
   #:use-module (guix packages)
   #:use-module (guix download)
+  #:use-module (guix utils)
   #:use-module (guix build-system gnu)
   #:use-module (guix build-system python)
   #:use-module (guix build-system trivial))
@@ -215,9 +216,7 @@ using Python 2.4 or higher and provides access to the Olson timezone database.")
     (license x11)))
 
 (define-public python2-pytz
-  (package (inherit python-pytz)
-    (name "python2-pytz")
-    (arguments (append (package-arguments python-pytz) `(#:python ,python-2)))))
+  (package-with-python2 python-pytz))
 
 (define-public python-babel
   (package
@@ -247,8 +246,4 @@ etc. ")
     (license bsd-3)))
 
 (define-public python2-babel
-  (package (inherit python-babel)
-    (name "python2-babel")
-    (inputs
-     `(("python2-pytz" ,python2-pytz)))
-    (arguments (append (package-arguments python-babel) `(#:python ,python-2)))))
+  (package-with-python2 python-babel))