[Python-Dev] Retrieve an arbitrary element from a set without removing it

Stephen J. Turnbull stephen at xemacs.org
Mon Oct 26 08:48:39 CET 2009

"Martin v. Löwis" writes:

 > > res.get() would be a fairly obvious way to do it. Enough that I would
 > > probably never have gone searching for any of the other answers. Though
 > > personally, I think I would call it "set.peek()", but the specific name
 > > doesn't really matter to me.
 > Somebody proposed to call it .any(); this I like best (except that one
 > might expect that any takes a predicate as the argument).

Why not allow that?

    def any(self, predicate=lambda x: True, default=None)
        for a in self:
            if predicate(a):
            return default
        return a

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