python.pkgs.cheetah: move and update expression

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

···
+{ lib
+, buildPythonPackage
+, fetchPypi
+, markdown
+, isPy3k
+, TurboCheetah
+}:
+
+buildPythonPackage rec {
+  pname = "cheetah";
+  version = "2.4.4";
+
+  disabled = isPy3k;
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "be308229f0c1e5e5af4f27d7ee06d90bb19e6af3059794e5fd536a6f29a9b550";
+  };
+
+  propagatedBuildInputs = [ markdown ];
+
+  doCheck = false; # Circular dependency
+
+  checkInputs = [
+    TurboCheetah
+  ];
+
+  meta = {
+    homepage = http://www.cheetahtemplate.org/;
+    description = "A template engine and code generation tool";
+    license = lib.licenses.mit;
+  };
+}

pkgs/top-level/python-packages.nix

···
 
   characteristic = callPackage ../development/python-modules/characteristic { };
 
-  cheetah = buildPythonPackage rec {
-    version = "2.4.4";
-    name = "cheetah-${version}";
-    disabled = isPy3k;
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/C/Cheetah/Cheetah-${version}.tar.gz";
-      sha256 = "be308229f0c1e5e5af4f27d7ee06d90bb19e6af3059794e5fd536a6f29a9b550";
-    };
-
-    propagatedBuildInputs = with self; [ self.markdown ];
-
-    meta = {
-      homepage = http://www.cheetahtemplate.org/;
-      description = "A template engine and code generation tool";
-    };
-  };
+  cheetah = callPackage ../development/python-modules/cheetah { };
 
   cherrypy = callPackage ../development/python-modules/cherrypy {};