[PATCH] gnu: Add python-pycontracts.

[Danny Milosavljevic <dannym@scratchpost.org>]

* gnu/packages/python.scm (python-pycontracts, python2-pycontracts):
  New variables.
---
 gnu/packages/python.scm | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/gnu/packages/python.scm b/gnu/packages/python.scm
index 4dc284d03..1cd4f168a 100644
--- a/gnu/packages/python.scm
+++ b/gnu/packages/python.scm
@@ -2201,6 +2201,38 @@ have failed since the last commit or what tests are currently failing.")
 (define-public python2-testrepository
   (package-with-python2 python-testrepository))
 
+(define-public python-pycontracts
+  (package
+    (name "python-pycontracts")
+    (version "1.7.15")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (pypi-uri "PyContracts" version))
+        (sha256
+          (base32
+            "0sf41nccy5ihymiab31sfc4ylxd87fvvhbzqd8lhw7fnryskmgr4"))))
+    (build-system python-build-system)
+    (propagated-inputs
+     `(("python-decorator" ,python-decorator)
+       ("python-pyparsing" ,python-pyparsing)
+       ("python-six" ,python-six)))
+    (native-inputs
+     `(("python-nose" ,python-nose)))
+    (home-page "http://andreacensi.github.com/contracts/")
+    (synopsis "Checks declared constraints on function parameters and return
+values")
+    (description "PyContracts is a Python package that allows to declare
+constraints on function parameters and return values.   Contracts can be
+specified using Python3 annotations, in a decorator, or inside a docstring
+:type: and :rtype: tags.  PyContracts supports a basic type system, variables
+binding, arithmetic constraints, and has several specialized contracts
+(notably for Numpy arrays), as well as an extension API.")
+  (license license:lgpl3)))
+
+(define-public python2-pycontracts
+  (package-with-python2 python-pycontracts))
+
 (define-public python-coverage
   (package
     (name "python-coverage")