anchor.diff:      };
   
       buildInputs = [ self.nose ];
  -    propagatedBuildInputs = with self; [ 
  -      dateutil 
  +    propagatedBuildInputs = with self; [
  +      dateutil
         numpy
         scipy
         numexpr
  
positive.code: 
      checkPhase = ''
        runHook preCheck
        
        # The flag `-A 'not network'` will disable tests that use internet.
        # The `-e` flag disables a few problematic tests.
        python setup.py nosetests -A 'not network' --stop -e 'test_clipboard|test_series' --verbosity=3
  
negative.code:     version = "1.0.0";
      src = pkgs.fetchurl {
        url = "https://pypi.python.org/packages/source/B/Bottleneck/Bottleneck-${version}.tar.gz";
        sha256 = "15dl0ll5xmfzj2fsvajzwxsb9dbw5i9fx9i4r6n4i5nzzba7m6wd";
      };
      propagatedBuildInputs = [self.numpy];
    };
  