[Python-Dev] Proposal: defaultdict

Nick Coghlan ncoghlan at gmail.com
Sat Feb 18 08:23:20 CET 2006

Guido van Rossum wrote:
> I'd much rather be able to write "if key in d" and get the result I want...

Somewhere else in this byzantine thread, I realised that what was really 
bothering me was the conditional semantics that dict ended up with (i.e., it's 
behaviour changed significantly if the default factory was set).

If we go back to your idea of collection.defaultdict (or Alex's name 
collection.autodict), then the change in semantics bothers me a lot less, and 
I'd be all in favour of the more usual variant (where "key in d" implies "key 
in d.keys()".


Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia

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