python.pkgs.Babel: move expression

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

@@ -0,0 +1,22 @@
+{ lib, buildPythonPackage, fetchPypi, pytz, pytest }:
+
+buildPythonPackage rec {
+  pname = "Babel";
+  version = "2.3.4";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0x98qqqw35xllpcama013a9788ly84z8dm1w2wwfpxh2710c8df5";
+  };
+
+  propagatedBuildInputs = [ pytz ];
+
+  checkInputs = [ pytest ];
+
+  meta = with lib; {
+    homepage = http://babel.edgewall.org;
+    description = "A collection of tools for internationalizing Python applications";
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ garbas ];
+  };
+}

pkgs/top-level/python-packages.nix

@@ -10637,24 +10637,7 @@ in {
 
   pygit2 = callPackage ../development/python-modules/pygit2 { };
 
-  Babel = buildPythonPackage (rec {
+  Babel = callPackage ../development/python-modules/Babel { };
-    name = "Babel-2.3.4";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/B/Babel/${name}.tar.gz";
-      sha256 = "0x98qqqw35xllpcama013a9788ly84z8dm1w2wwfpxh2710c8df5";
-    };
-
-    buildInputs = with self; [ pytest ];
-    propagatedBuildInputs = with self; [ pytz ];
-
-    meta = {
-      homepage = http://babel.edgewall.org;
-      description = "A collection of tools for internationalizing Python applications";
-      license = licenses.bsd3;
-      maintainers = with maintainers; [ garbas ];
-    };
-  });
 
   pybfd = callPackage ../development/python-modules/pybfd { };