anchor.diff:      owner = "mwouts";
       repo = pname;
       rev = "refs/tags/v${version}";
  -    sha256 = "sha256-ebe5sQJxA8QE6eJp6vPUyMaEvZUPqzCmQ6damzo1BVo=";
  +    sha256 = "sha256-a/dvY7MLCjYGOvsCC5tiIIJpApNriRtBN63VK+McEVw=";
     };
   
     buildInputs = [
  
positive.code:     notebook
      pytestCheckHook
    ];
  
    postPatch = ''
      # https://github.com/mwouts/jupytext/pull/885
      substituteInPlace setup.py \
        --replace "markdown-it-py~=1.0" "markdown-it-py>=1.0.0,<3.0.0"
    '';
  
    preCheck = ''
      # Tests that use a Jupyter notebook require $HOME to be writable
  
negative.code: 
  buildPythonPackage rec {
    pname = "jupytext";
    version = "1.14.0";
    format = "pyproject";
  
    disabled = pythonOlder "3.6";
  