gnu: Add python-whichcraft.

* gnu/packages/python-xyz.scm (python-whichcraft): New public variable.

Signed-off-by: Mathieu Othacehe <m.othacehe@gmail.com>

gnu/packages/python-xyz.scm

@@ -9127,6 +9127,27 @@ server with very acceptable performance.")
 (define-public python2-waitress
   (package-with-python2 python-waitress))
 
+(define-public python-whichcraft
+  (package
+    (name "python-whichcraft")
+    (version "0.6.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "whichcraft" version))
+       (sha256
+        (base32
+         "11yfkzyplizdgndy34vyd5qlmr1n5mxis3a3svxmx8fnccdvknxc"))))
+    (build-system python-build-system)
+    (native-inputs
+     `(("python-pytest" ,python-pytest)))
+    (home-page "https://github.com/pydanny/whichcraft")
+    (synopsis "Cross-platform cross-python shutil.which functionality")
+    (description
+     "This package provides a shim of the shutil.which function that's
+designed to work across multiple versions of Python.")
+    (license license:bsd-3)))
+
 (define-public python-pyquery
   (package
     (name "python-pyquery")