anchor.diff:      version = "1.0.0";
       src = pkgs.fetchurl {
         url = "https://pypi.python.org/packages/source/B/Bottleneck/Bottleneck-${version}.tar.gz";
  -      md5 = "380fa6f275bd24f27e7cf0e0d752f5d2";
  +      sha256 = "15dl0ll5xmfzj2fsvajzwxsb9dbw5i9fx9i4r6n4i5nzzba7m6wd";
       };
       propagatedBuildInputs = [self.numpy];
     };
  
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:       bottleneck
        sqlalchemy9
        lxml
        modules.sqlite3
      ];
  
      preCheck = ''
  