anchor.diff:  }:
   
   buildPythonPackage rec {
  -  version = "6.1.2";
     pname = "pytest";
  -
  +  version = "6.2.2";
     disabled = !isPy3k;
   
     src = fetchPypi {
       inherit pname version;
  -    sha256 = "c0a7e94a8cdbc5422a51ccdad8e6f1024795939cc89159a0ae7f0b316ad3823e";
  +    sha256 = "sha256-nR7fnn0LhNcuo9vN/SKzX7VDpejypgCS3VeJNr9j1/k=";
     };
   
  -  checkInputs = [ hypothesis pygments ];
  -  nativeBuildInputs = [ setuptools_scm ];
  +  nativeBuildInputs = [ setuptools-scm ];
  +
     propagatedBuildInputs = [
       atomicwrites
       attrs
  
positive.code: { lib, buildPythonPackage, pythonOlder, fetchPypi, isPy3k, isPyPy
  , atomicwrites
  , attrs
  , funcsigs
  , hypothesis
  , iniconfig
  , mock
  , more-itertools
  , packaging
  , pathlib2
  , pluggy
  , py
  , pygments
  , python
  , setuptools
  , setuptools_scm
  , six
  , toml
  , wcwidth
  
negative.code:   ];
  
    meta = with lib; {
      description = "Framework for writing tests";
      homepage = "https://docs.pytest.org";
      changelog = "https://github.com/pytest-dev/pytest/releases/tag/${version}";
      maintainers = with maintainers; [ domenkozar lovek323 madjar lsix ];
      license = licenses.mit;
    };
  