anchor.diff:  buildPythonPackage rec {
     pname = "datashader";
     version = "0.13.0";
  +  format = "setuptools";
   
     src = fetchPypi {
       inherit pname version;
       sha256 = "sha256-6JscHm1QjDmXOLLa83qhAvY/xwvlPM6duQ1lSxnCVV8=";
     };
  -
  -  # the complete extra is for usage with conda, which we
  -  # don't care about
  -  postPatch = ''
  -    substituteInPlace setup.py \
  -      --replace "dask[complete]" "dask"
  -  '';
   
     propagatedBuildInputs = [
       dask
  
positive.code: 
    checkInputs = [
      pytestCheckHook
      pytest-xdist # not needed
      nbsmoke
      fastparquet
      nbconvert
      netcdf4
    ];
  
    preCheck = ''
      export HOME=$TMPDIR
  
negative.code:     "datashader/tests/test_datatypes.py"
    ];
  
    pythonImportsCheck = [
      "datashader"
    ];
  
    meta = with lib;{
      description = "Data visualization toolchain based on aggregating into a grid";
      homepage = "https://datashader.org";
      license = licenses.bsd3;
      maintainers = with maintainers; [ costrouc ];
    };
  }
  