def _all_filenames(self):
        """Return a list of absolute cache filenames"""
        try:
            return [os.path.join(self.cache_dir, filename) for filename in
                    os.listdir(self.cache_dir)]
        except (FileNotFoundError, OSError):
            return []
def _all_filenames ( self ) : try : return [ os . path . join ( self . cache_dir , filename ) for filename in os . listdir ( self . cache_dir ) ] except ( FileNotFoundError , OSError ) : return [ ]
Return a list of absolute cache filenames