anchor.diff:        pymongo_2_9_1
         simplejson
         werkzeug
  -
       ];
   
       # tests call a running mongodb instance
  
positive.code:   virtual-display = buildPythonPackage rec {
      name = "PyVirtualDisplay-0.1.5";
  
      propagatedBuildInputs = with self; [ easy-process ];
  
      src = pkgs.fetchurl {
        url = "mirror://pypi/P/PyVirtualDisplay/${name}.tar.gz";
  
negative.code:     };
    };
  
    EasyProcess = buildPythonPackage rec {
      name = "EasyProcess-0.2.3";
  
      src = pkgs.fetchurl {
        url = "mirror://pypi/E/EasyProcess/${name}.tar.gz";
        sha256 = "94e241cadc9a46f55b5c06000df85618849602e7e1865b8de87576b90a22e61f";
      };
  
      # No tests
      doCheck = false;
  
      meta = {
        description = "Easy to use python subprocess interface";
  