Convenience function for a deprecation warning. Logs a message both as a warning as well as using the `warnings` package's `DeprecationWarning`.

deprecation_warning_log.py

import logging
import warnings


def deprecation_warning(logger: logging.Logger, msg: str) -> None:
    """Creates a deprecation warning log event with given the message and logger.
    
    Convenience function for a deprecation warning. Logs a message both as a warning
    as well as using the `warnings` package's `DeprecationWarning`.
    """
    logger.warning(msg)
    warnings.simplefilter("always", DeprecationWarning)
    warnings.warn(msg, DeprecationWarning)