gnu: Add python-taskgroup.

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

Change-Id: Ic92ff1e687bbb8b30238e356bf80ed944ff9f87b

gnu/packages/python-xyz.scm

@@ -36012,6 +36012,28 @@ quite huge, this Guix package doesn't depend on pandas.  In case, just also
 install @code{python-pandas}.")
     (license license:expat)))
 
+(define-public python-taskgroup
+  (package
+    (name "python-taskgroup")
+    (version "0.0.0a4")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "taskgroup" version))
+       (sha256
+        (base32 "170m7b59nxrhzs0nz6brj9brz4rzvw6k587ja0cnc9qy48nr027b"))))
+    (build-system pyproject-build-system)
+    (arguments
+     (list #:tests? #f)) ; no tests in PyPI and Git checkout
+    (native-inputs
+     (list python-flit-core))
+    (home-page "https://github.com/graingert/taskgroup")
+    (synopsis "Backport of asyncio.TaskGroup, asyncio.Runner and asyncio.timeout")
+    (description
+     "This package provides a backport of @code{asyncio.TaskGroup},
+@code{asyncio.Runner} and @code{asyncio.timeout}.")
+    (license license:expat)))
+
 (define-public python-csb43
   (package
     (name "python-csb43")