anchor.diff:        sha256 = "0bhiyx41kilvy04cgjbvjy2r4b6l7zz31fbrg3l6lvnqm26nihb0";
       };
   
  -    buildInputs = [ pkgs.setuptools ] ++
  -                  (if python.majorVersion == "2.6" then [ argparse ] else []);
  +    buildInputs = [ pkgs.setuptools ] ++ (optional isPy26 argparse);
   
       meta = {
         description = "automatically generated zsh completion function for Python's option parser modules";
  
positive.code:       description = "nose2 plugin for coverage reporting, including subprocesses and multiprocessing";
      };
      buildInputs = [ covCore nose2 ];
    };
  
    notify = pkgs.stdenv.mkDerivation (rec {
      name = "python-notify-0.1.1";
  
negative.code:     propagatedBuildInputs = [ six ];
      # AttributeError: 'module' object has no attribute 'collector'
      doCheck = false;
    });
  
    nose2Cov = if isPy26 then null else (buildPythonPackage rec {
      name = "nose2-cov-1.0a4";
      src = fetchurl {
        url = "http://pypi.python.org/packages/source/n/nose2-cov/nose2-cov-1.0a4.tar.gz";
  