anchor.diff:  , fetchFromGitHub
   , fsspec
   , pytestCheckHook
  +, pytest-rerunfailures
   , pythonOlder
   , cloudpickle
   , numpy
  
positive.code: 
  buildPythonPackage rec {
    pname = "dask";
    version = "2021.01.0";
  
    disabled = pythonOlder "3.5";
  
  
negative.code:     owner = "dask";
      repo = pname;
      rev = version;
      sha256 = "LACv7lWpQULQknNGX/9vH9ckLsypbqKDGnsNBgKT1eI=";
    };
  
    checkInputs = [
      pytestCheckHook
      pytest-rerunfailures
    ];
  
    dontUseSetuptoolsCheck = true;
  