pythonPackages.retrying: refactor move to python-modules

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

@@ -0,0 +1,27 @@
+{ stdenv
+, buildPythonPackage
+, fetchPypi
+, six
+}:
+
+buildPythonPackage rec {
+  pname = "retrying";
+  version = "1.3.3";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0fwp86xv0rvkncjdvy2mwcvbglw4w9k0fva25i7zx8kd19b3kh08";
+  };
+
+  propagatedBuildInputs = [ six ];
+
+  # doesn't ship tests in tarball
+  doCheck = false;
+
+  meta = with stdenv.lib; {
+    homepage = https://github.com/rholder/retrying;
+    description = "General-purpose retrying library";
+    license = licenses.asl20;
+  };
+
+}