pythonPackages.singledispatch: move expression (#44654)

pkgs/development/python-modules/singledispatch/default.nix

@@ -0,0 +1,27 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, six
+}:
+
+buildPythonPackage rec {
+  pname = "singledispatch";
+  version = "3.4.0.3";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "5b06af87df13818d14f08a028e42f566640aef80805c3b50c5056b086e3c2b9c";
+  };
+
+  propagatedBuildInputs = [ six ];
+
+  # pypi singledispatch tarbal does not contain tests
+  doCheck = false;
+
+  meta = {
+    description = "This library brings functools.singledispatch from Python 3.4 to Python 2.6-3.3.";
+    homepage = https://docs.python.org/3/library/functools.html;
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ costrouc ];
+  };
+}