anchor.diff:      owner = "python-attrs";
       repo = pname;
       rev = "v${version}";
  -    hash = "sha256-VbfQMMDO03eeUHAACxoX6a3DKmzoF9EfLuTpvaY6bWs=";
  +    hash = "sha256-C8uIsewpgJfB1yYckWTwF5K32+2AAOrxFKB9I18RENg=";
     };
   
     nativeBuildInputs = [
  
positive.code: 
  buildPythonPackage rec {
    pname = "cattrs";
    version = "1.10.0";
    format = "pyproject";
  
    disabled = pythonOlder "3.7";
  
negative.code:     immutables
      motor
      msgpack
      orjson
      pytest-xdist
      pytestCheckHook
      pyyaml
  