import logging import threading logger = logging.getLogger(__name__) def log(fn): def log_inner(*a, **kw): logger.info('%s(%s,

import logging import threading logger = logging.getLogger(__name__) def log(fn): def log_inner(*a, **kw): logger.info('%s(%s, %s) @ %s', fn, a, kw, threading.get_native_id()) return fn(*a, **kw) return log_inner It's pretty easy to grab all the arguments and thread, but grabbing the return would depend on you not mutating anything permanent, so that probably needs some special casing.