anchor.diff:  
     postPatch = ''
       substituteInPlace pyproject.toml \
  +      --replace 'license = "ISC"' 'license = {text = "ISC"}' \
         --replace 'dynamic = ["version"]' 'version = "${version}"'
     '';
   
  
positive.code: 
  buildPythonPackage rec {
    pname = "mkdocstrings-python";
    version = "0.7.1";
    format = "pyproject";
  
    disabled = pythonOlder "3.7";
  
negative.code:     owner = "mkdocstrings";
      repo = "python";
      rev = version;
      hash = "sha256-KAVBK0ZR1R27cWH99DVOYNFWKa4ubBXzgM0hVpGRIpE=";
    };
  
    nativeBuildInputs = [
  