langchain/llms/anthropic.py/_AnthropicCommon/_get_anthropic_stop
class _AnthropicCommon:    def _get_anthropic_stop(self, stop: Optional[List[str]] = None) -> List[str]:
        if not self.HUMAN_PROMPT or not self.AI_PROMPT:
            raise NameError("Please ensure the anthropic package is loaded")

        if stop is None:
            stop = []

        # Never want model to invent new turns of Human / Assistant dialog.
        stop.extend([self.HUMAN_PROMPT])

        return stop