python.pkgs.ipython_genutils: move expression

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

···
+{ lib
+, buildPythonPackage
+, fetchPypi
+, nose
+, glibcLocales
+}:
+
+buildPythonPackage rec {
+  pname = "ipython_genutils";
+  version = "0.2.0";
+  name = "${pname}-${version}";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "eb2e116e75ecef9d4d228fdc66af54269afa26ab4463042e33785b887c628ba8";
+  };
+
+  checkInputs = [ nose glibcLocales ];
+
+  checkPhase = ''
+    LC_ALL="en_US.UTF-8" nosetests -v ipython_genutils/tests
+  '';
+
+  meta = {
+    description = "Vestigial utilities from IPython";
+    homepage = http://ipython.org/;
+    license = lib.licenses.bsd3;
+    maintainers = with lib.maintainers; [ fridh ];
+  };
+}

pkgs/top-level/python-packages.nix

···
 
   ipython_6 = callPackage ../development/python-modules/ipython { };
 
-  ipython_genutils = buildPythonPackage rec {
-    version = "0.2.0";
-    name = "ipython_genutils-${version}";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/i/ipython_genutils/${name}.tar.gz";
-      sha256 = "eb2e116e75ecef9d4d228fdc66af54269afa26ab4463042e33785b887c628ba8";
-    };
-
-    LC_ALL = "en_US.UTF-8";
-    buildInputs = with self; [ nose pkgs.glibcLocales ];
-
-    checkPhase = ''
-      nosetests -v ipython_genutils/tests
-    '';
-
-    meta = {
-      description = "Vestigial utilities from IPython";
-      homepage = http://ipython.org/;
-      license = licenses.bsd3;
-      maintainers = with maintainers; [ fridh ];
-    };
-  };
-
+  ipython_genutils = callPackage ../development/python-modules/ipython_genutils { };
 
   ipywidgets = callPackage ../development/python-modules/ipywidgets { };