On sam., 2014年02月22日 at 19:29 +0900, Stephen J. Turnbull wrote: > Antoine Pitrou writes: > > > Well, the only way to know that a key (or attribute) exists is to do > > the lookup. What else would you suggest? > > Do the lookup at the C level (or whatever the implementation language > is) and generate no exception, of course. That's what would make it > possibly more efficient.
Let's see: - hasattr() does the lookup at the C level, and silences the AttributeError - dict.get() does the lookup at the C level, and doesn't generate an exception So apart from the minor inefficiency of generating and silencing the AttributeError, those functions already do what you suggest. Regards Antoine. _______________________________________________ Python-Dev mailing list [email protected] https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com