gnu: Add python-argh.

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

gnu/packages/python-xyz.scm

@@ -17397,3 +17397,25 @@ (define-public python-iocapture
     (description "This package allows Python developpers to capture their standard
 output and standard error.")
     (license license:expat)))
+
+(define-public python-argh
+  (package
+    (name "python-argh")
+    (version "0.26.2")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (pypi-uri "argh" version))
+        (sha256
+         (base32
+          "0rdv0n2aa181mkrybwvl3czkrrikgzd4y2cri6j735fwhj65nlz9"))))
+    (build-system python-build-system)
+    (native-inputs
+     `(("python-iocapture" ,python-iocapture)
+       ("python-mock" ,python-mock)
+       ("python-pytest" ,python-pytest)))
+    (home-page "https://github.com/neithere/argh/")
+    (synopsis "Argparse wrapper with natural syntax")
+    (description "This package provides a parser for dealing with command-line
+arguments in Python.")
+    (license license:lgpl3)))