anchor.diff:      owner = "marshmallow-code";
       repo = pname;
       rev = version;
  -    sha256 = "sha256-tP/RKo2Hzxz2bT7ybRs9wGzq7TpsmzmOPi3BGuSLDA0=";
  +    hash = "sha256-ZqMrMNfP/RKW2jQDNPgfhyeqmSc40pZbnrcXHbw2emc=";
     };
   
     checkInputs = [
  
positive.code:   ];
  
    meta = with lib; {
      description = ''
        A lightweight library for converting complex objects to and from
        simple Python datatypes.
      '';
      homepage = "https://github.com/marshmallow-code/marshmallow";
      license = licenses.mit;
      maintainers = with maintainers; [ cript0nauta ];
  
negative.code: { lib
  , buildPythonPackage
  , fetchFromGitHub
  , pytestCheckHook
  , pythonOlder
  , pytz
  , simplejson
  }:
  
  buildPythonPackage rec {
    pname = "marshmallow";
    version = "3.15.0";
    format = "setuptools";
  
    disabled = pythonOlder "3.6";
  
  