def format_usage(self, ctx, formatter):
        """Writes the usage line into the formatter.

        This is a low-level method called by :meth:`get_usage`.
        """
        pieces = self.collect_usage_pieces(ctx)
        formatter.write_usage(ctx.command_path, " ".join(pieces))
Writes the usage line into the formatter.

        This is a low-level method called by :meth:`get_usage`.
        
dynaconf/vendor/click/core.py