I don't expect logging.warning to change in future versions of Python (currently it substitutes extra args as % operator, so you'd have to write logging.warning

I don't expect logging.warning to change in future versions of Python (currently it substitutes extra args as % operator, so you'd have to write logging.warning('Unusual situation foo=%s, bar=%s', foo, bar)) since it would unnecessarily break too much code. But since print doesn't return any usable value, it can be easily updated to return a useful value.