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[Python-Dev] Re: Sets: elt in dict, lst.include
Ka-Ping Yeeping@lfw.org
Tue, 23 Jan 2001 19:29:24 -0800 (PST)
I wrote:> The only change that needs to be made to support sets of immutable> elements is to provide "in" on dictionaries.Thomas Wouters wrote:> It's come up before. The problem with it is that it's not quite obvious> whether it is 'if key in dict' or 'if value in dict'.Yes, and i've seen this objection before, and i think it's silly.> Sure, from the above> example it's obvious what you *expect*, but I suspect that 'for x in dict'> will result in a 40/60 split in expectations,No way... it's at least 90/10.How often do you write 'dict.has_key(x)'? (std lib says: 206)How often do you write 'for x in dict.keys()'? (std lib says: 49)How often do you write 'x in dict.values()'? (std lib says: 0)How often do you write 'for x in dict.values()'? (std lib says: 3)I rest my case.-- ?!ng
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