def __getattr__(self,attr):
        if attr is not 'data_files':  # lazily compute data files
            self.data_files = files = self._get_data_files(); return files
        return _build_py.__getattr__(self,attr)
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/setuptools-0.6c11/setuptools/command/build_py.py/build_py.__getattr__/operator `==` -> `is not`