anchor.diff:  buildPythonPackage rec {
     pname = "path.py";
     version = "11.5.0";
  -  name = pname + "-" + version;
   
     src = fetchPypi {
       inherit pname version;
       sha256 = "b6687a532a735a2d79a13e92bdb31cb0971abe936ea0fa78bcb47faf4372b3cb";
     };
   
  -  checkInputs = [ pytest pytestrunner glibcLocales packaging ];
  +  checkInputs = [ pytest pytest-flake8 glibcLocales packaging ];
     buildInputs = [ setuptools_scm ];
     propagatedBuildInputs = [
       importlib-metadata
  
positive.code:   };
  
    checkPhase = ''
      # Ignore pytest configuration
      rm pytest.ini
      # ignore performance test which may fail when the system is under load
      py.test -v -k 'not TestPerformance' test_path.py
    '';
  }
  
negative.code: , buildPythonPackage
  , fetchPypi
  , setuptools_scm
  , pytest
  , pytest-flake8
  , glibcLocales
  , packaging
  , isPy27
  