Method add_parse_callback

python/python3/tornado/options.py:473–475

Adds a parse callback, to be invoked when option parsing is done.

(self, callback: Callable[[], None])

            sys.exit(0)

    def add_parse_callback(self, callback: Callable[[], None]) -> None:
        """Adds a parse callback, to be invoked when option parsing is done."""
        self._parse_callbacks.append(callback)

    def run_parse_callbacks(self) -> None:
        for callback in self._parse_callbacks: