anchor.diff:      };
   
       buildInputs = [ self.nose ];
  -    propagatedBuildInputs = with self; [ 
  -      dateutil 
  +    propagatedBuildInputs = with self; [
  +      dateutil
         numpy
         scipy
         numexpr
  
positive.code:     version = "0.9.3";
      src = pkgs.fetchurl {
        url = "https://pypi.python.org/packages/source/x/xlrd/xlrd-${version}.tar.gz";
        md5 = "6f3325132f246594988171bc72e1a385";
      };
    };
  
  
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];
    };
  