python.pkgs.yamllint: move to separate expression

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

@@ -0,0 +1,24 @@
+{ stdenv, buildPythonPackage, fetchPypi
+, nose, pyyaml }:
+
+buildPythonPackage rec {
+  pname = "yamllint";
+  version = "0.5.2";
+  name = "${pname}-${version}";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0brdy1crhfng10hlw0420bv10c2xnjk8ndnhssybkzym47yrzg84";
+  };
+
+  buildInputs = [ nose ];
+
+  propagatedBuildInputs = [  pyyaml ];
+
+  meta = with stdenv.lib; {
+    description = "A linter for YAML files";
+    homepage = "https://github.com/adrienverge/yamllint";
+    license = licenses.gpl3;
+    maintainers = with maintainers; [ mikefaille ];
+  };
+}

pkgs/top-level/python-packages.nix

@@ -29956,26 +29956,7 @@ EOF
     };
   };
 
-  yamllint = buildPythonPackage rec {
+  yamllint = callPackage ../development/python-modules/yamllint { };
-    name = "${pname}-${version}";
-    pname = "yamllint";
-    version = "0.5.2";
-
-    src = pkgs.fetchurl{
-      url = "mirror://pypi/y/${pname}/${name}.tar.gz";
-      sha256 = "0brdy1crhfng10hlw0420bv10c2xnjk8ndnhssybkzym47yrzg84";
-    };
-
-    buildInputs = with self; [ nose ];
-    propagatedBuildInputs = with self; [  pyyaml ];
-
-    meta = {
-      homepage = "https://github.com/adrienverge/yamllint";
-      description = "A linter for YAML files";
-      license = licenses.gpl3;
-      maintainers = with maintainers; [ mikefaille ];
-    };
-  };
 
   yarl = callPackage ../development/python-modules/yarl { };