docs: def set_name(self, name):
          """
          RETURN NEW FILE WITH GIVEN EXTENSION
          """
          path = self._filename.split("/")
          parts = path[-1].split(".")
          if len(parts) == 1:
              path[-1] = name
          else:
              path[-1] = name + "." + parts[-1]
          return File("/".join(path))