anchor.diff:      owner = "mwouts";
       repo = pname;
       rev = "v${version}";
  -    hash = "sha256-S2SKAC2oT4VIVMMDbu/Puo87noAgnQs1hh88JphutA8=";
  +    sha256 = "sha256-S2SKAC2oT4VIVMMDbu/Puo87noAgnQs1hh88JphutA8=";
     };
   
  -  buildInputs = [ jupyter-packaging jupyterlab ];
  +  buildInputs = [
  +    jupyter-packaging
  +    jupyterlab
  +  ];
  +
     propagatedBuildInputs = [
       markdown-it-py
       mdit-py-plugins
  
positive.code:   ];
  
    checkInputs = [
      pytestCheckHook
      GitPython
      jupyter-client
      notebook
    ];
    # Tests that use a Jupyter notebook require $HOME to be writable.
    HOME = "$TMPDIR";
    # Pre-commit tests expect the source directory to be a Git repository.
    pytestFlagsArray = [ "--ignore-glob='tests/test_pre_commit_*.py'" ];
    pythonImportsCheck = [ "jupytext" "jupytext.cli" ];
  
    meta = with lib; {
      description = "Jupyter notebooks as Markdown documents, Julia, Python or R scripts";
  
negative.code: { lib
  , buildPythonPackage
  , fetchFromGitHub
  , GitPython
  , jupyter-client
  , jupyter-packaging
  , jupyterlab
  , markdown-it-py
  , mdit-py-plugins
  , nbformat
  , notebook
  , pytestCheckHook
  , pythonOlder
  , pyyaml
  , toml
  }:
  
  buildPythonPackage rec {
    pname = "jupytext";
    version = "1.13.2";
    format = "pyproject";
  
    disabled = pythonOlder "3.6";
  