[Python-Dev] PEP 463: Exception-catching expressions
Stephen J. Turnbull
stephen at xemacs.org
Sat Feb 22 12:54:22 CET 2014
Antoine Pitrou writes:
> On sam., 2014-02-22 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
> - dict.get() does the lookup at the C level, and doesn't generate an
> So apart from the minor inefficiency of generating and silencing the
> AttributeError, those functions already do what you suggest.
But that's precisely the inefficiency I'm referring to.
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