python: pytz: 2017.2 -> 2017.3

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

@@ -0,0 +1,23 @@
+{ lib, buildPythonPackage, fetchPypi, python }:
+
+buildPythonPackage rec {
+  pname = "pytz";
+  version = "2017.3";
+
+  src = fetchPypi {
+    inherit pname version;
+    extension = "zip";
+    sha256 = "fae4cffc040921b8a2d60c6cf0b5d662c1190fe54d718271db4eb17d44a185b7";
+  };
+
+  checkPhase = ''
+    ${python.interpreter} -m unittest discover -s pytz/tests
+  '';
+
+  meta = with lib; {
+    description = "World timezone definitions, modern and historical";
+    homepage = "http://pythonhosted.org/pytz";
+    license = licenses.mit;
+    maintainers = with maintainers; [ dotlambda ];
+  };
+}

pkgs/top-level/python-packages.nix

@@ -14855,27 +14855,7 @@ in {
     };
   };
 
-  pytz = buildPythonPackage rec {
+  pytz = callPackage ../development/python-modules/pytz { };
-    name = "${pname}-${version}";
-    pname = "pytz";
-    version = "2017.2";
-
-    src = fetchPypi {
-      inherit pname version;
-      sha256 = "12cmd3j46d2gcw08bspvp6s9icfcvx88zjz52n1bli9dyvl5dh7m";
-      extension = "zip";
-    };
-
-    checkPhase = ''
-      python -m unittest discover -s pytz/tests
-    '';
-
-    meta = {
-      description = "World timezone definitions, modern and historical";
-      homepage = "http://pythonhosted.org/pytz";
-      license = licenses.mit;
-    };
-  };
 
   pytzdata = callPackage ../development/python-modules/pytzdata { };