code: def listing(self):
          "Return a list of filename entries currently in the archive"
          return ['.'.join([f,ext]) if ext else f for (f,ext) in self._files.keys()f listing(self):
          "Return a list of filename entries currently in the archive"
          return ['.'.join([f,ext]) if ext else f for (f,ext) in self._files.keys()]
docs: Return a list of filename entries currently in the archive