anchor.diff:    src = fetchPyPi {
       package = "bleach";
       inherit version;
  -    sha256 = "1293061adb5a9eebb7b260516e691785ac08cc1646c8976aeda7db9dbb1c6f4b";
  +    sha256 = "978e758599b54cd3caa2e160d74102879b230ea8dc93871d0783721eef58bc65";
     };
   
     propagatedBuildInputs = [
  
positive.code:     six
    ];
  
    preConfigure = ''
      sed -i '/html5lib/ s/\(,\|\)\(>\|<\|=\)\(=\|\)[0-9.]\+//g' setup.py bleach.egg-info/requires.txt
    '';
  
    meta = with stdenv.lib; {
  
negative.code: }:
  
  let
    version = "1.5.0";
  in
  buildPythonPackage {
    name = "bleach-${version}";
  