langchain/chains/constitutional_ai/base.py/ConstitutionalChain/get_principles
class ConstitutionalChain:    def get_principles(
        cls, names: Optional[List[str]] = None
    ) -> List[ConstitutionalPrinciple]:
        if names is None:
            return list(PRINCIPLES.values())
        else:
            return [PRINCIPLES[name] for name in names]