pythonPackages.pygal: refactor move to python-modules

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

@@ -0,0 +1,36 @@
+{ stdenv
+, buildPythonPackage
+, fetchPypi
+, isPyPy
+, flask
+, pyquery
+, pytest
+, cairosvg
+, tinycss
+, cssselect
+, lxml
+}:
+
+buildPythonPackage rec {
+  pname = "pygal";
+  version = "2.3.1";
+
+  doCheck = !isPyPy;  # one check fails with pypy
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "7ba5a191233d0c2d8bf4b4d26b06e42bd77483a59ba7d3e5b884d81d1a870667";
+  };
+
+  buildInputs = [ flask pyquery pytest ];
+  propagatedBuildInputs = [ cairosvg tinycss cssselect ]
+    ++ stdenv.lib.optionals (!isPyPy) [ lxml ];
+
+  meta = with stdenv.lib; {
+    description = "Sexy and simple python charting";
+    homepage = http://www.pygal.org;
+    license = licenses.lgpl3;
+    maintainers = with maintainers; [ sjourdois ];
+  };
+
+}