anchor.diff:      xlrd
       xlwt
     ];
  +
  +  checkInputs = [ pytestCheckHook glibcLocales moto hypothesis ];
   
     # doesn't work with -Werror,-Wunused-command-line-argument
     # https://github.com/NixOS/nixpkgs/issues/39687
  
positive.code:     "--parallel=$NIX_BUILD_CORES"
    ];
  
  
    disabledTests = stdenv.lib.concatMapStringsSep " and " (s: "not " + s) ([
      # since dateutil 0.6.0 the following fails: test_fallback_plural, test_ambiguous_flags, test_ambiguous_compat
      # was supposed to be solved by https://github.com/dateutil/dateutil/issues/321, but is not the case
      "test_fallback_plural"
  
negative.code:     sha256 = "a979d0404b135c63954dea79e6246c45dd45371a88631cdbb4877d844e6de3b6";
    };
  
    nativeBuildInputs = [ cython ];
    buildInputs = optional isDarwin libcxx;
    propagatedBuildInputs = [
  