def warning(self):
        """Issue warning that this singleton already exists."""

        logger.warning(
            (
                "Singleton instance of type %s already created at:\n%s\n"
                "You can delete the singleton by calling `<instance>.delete_singleton()` or \n"
                f"""  ```python
  from trulens.core.utils.python import SingletonPerName
  SingletonPerName.delete_singleton_by_name(name="{self.name}", cls={self.cls.__name__})
  ```
            """
            ),
            self.cls.__name__,
            self.frameinfo_codeline,
        )
Issue warning that this singleton already exists.
src/trulens_eval/trulens_eval/utils/python.py