[Python-Dev] Proposal: defaultdict (original) (raw)

"Martin v. Löwis" martin at v.loewis.de
Sat Feb 18 00:52:51 CET 2006

Adam Olsen wrote:

Consider these two pieces of code:

if key in d: dosomething(d[key]) else: dosomethingelse() try: dosomething(d[key]) except KeyError: dosomethingelse() Before they were the same (assuming dosomething() won't raise KeyError). Now they would behave differently.

I personally think they should continue to do the same thing, i.e. "in" should return True if there is a default; in the current proposal, it should invoke the default factory.

But that's beside the point: Where is the real example where this difference would matter? (I'm not asking for a realistic example, I'm asking for a real one)

Regards, Martin

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