pythonPackages.pycontracts: Move to own file

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

@@ -0,0 +1,21 @@
+{ stdenv, buildPythonPackage, fetchPypi
+, nose, pyparsing, decorator, six }:
+
+buildPythonPackage rec {
+  pname = "PyContracts";
+  version = "1.7.9";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0rdc9pz08885vqkazjc3lyrrghmf3jzxnlsgpn8akl808x1qrfqf";
+  };
+
+  buildInputs = [ nose ];
+  propagatedBuildInputs = [ pyparsing decorator six ];
+
+  meta = with stdenv.lib; {
+    description = "Allows to declare constraints on function parameters and return values";
+    homepage = https://pypi.python.org/pypi/PyContracts;
+    license = licenses.lgpl2;
+  };
+}

pkgs/top-level/python-packages.nix

@@ -1840,25 +1840,7 @@ in {
 
   pycollada = callPackage ../development/python-modules/pycollada { };
 
-  pycontracts = buildPythonPackage rec {
+  pycontracts = callPackage ../development/python-modules/pycontracts { };
-    version = "1.7.9";
-    name = "PyContracts-${version}";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/P/PyContracts/${name}.tar.gz";
-      sha256 = "0rdc9pz08885vqkazjc3lyrrghmf3jzxnlsgpn8akl808x1qrfqf";
-    };
-
-    buildInputs = with self; [ nose ];
-
-    propagatedBuildInputs = with self; [ pyparsing decorator six ];
-
-    meta = {
-      description = "Allows to declare constraints on function parameters and return values";
-      homepage = https://pypi.python.org/pypi/PyContracts;
-      license = licenses.lgpl2;
-    };
-  };
 
   pycparser = buildPythonPackage rec {
     name = "pycparser-${version}";