<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def with_variants(self, variants: Union['Variant', List['Variant']]) -> 'CentralDogma': """Create a new entity with the given variants. :param variants: An optional variant or list of variants Example Usage: """

        return self.__class__(
            namespace=self.namespace,
            name=self.name,
            identifier=self.identifier,
            variants=variants,
        )