python.pkgs.traitlets: move expression

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

@@ -0,0 +1,35 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, glibcLocales
+, pytest
+, mock
+, ipython_genutils
+, decorator
+, enum34
+}:
+
+buildPythonPackage rec {
+  pname = "traitlets";
+  version = "4.3.2";
+  name = "${pname}-${version}";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "9c4bd2d267b7153df9152698efb1050a5d84982d3384a37b2c1f7723ba3e7835";
+  };
+
+  checkInputs = [ glibcLocales pytest mock ];
+  propagatedBuildInputs = [ ipython_genutils decorator enum34 ];
+
+  checkPhase = ''
+    LC_ALL="en_US.UTF-8" py.test $out
+  '';
+
+  meta = {
+    description = "Traitlets Python config system";
+    homepage = http://ipython.org/;
+    license = lib.licenses.bsd3;
+    maintainers = with lib.maintainers; [ fridh ];
+  };
+}

pkgs/top-level/python-packages.nix

@@ -21026,32 +21026,7 @@ in {
 
   testtools = callPackage ../development/python-modules/testtools { };
 
-  traitlets = buildPythonPackage rec {
+  traitlets = callPackage ../development/python-modules/traitlets { };
-    pname = "traitlets";
-    version = "4.3.2";
-    name = "${pname}-${version}";
-
-    src = fetchPypi {
-      inherit pname version;
-      sha256 = "9c4bd2d267b7153df9152698efb1050a5d84982d3384a37b2c1f7723ba3e7835";
-    };
-
-    LC_ALL = "en_US.UTF-8";
-
-    buildInputs = with self; [ pkgs.glibcLocales pytest mock ];
-    propagatedBuildInputs = with self; [ipython_genutils decorator enum34];
-
-    checkPhase = ''
-      py.test $out
-    '';
-
-    meta = {
-      description = "Traitlets Python config system";
-      homepage = http://ipython.org/;
-      license = licenses.bsd3;
-      maintainers = with maintainers; [ fridh ];
-    };
-  };
 
   python_mimeparse = buildPythonPackage rec {
     name = "python-mimeparse-${version}";