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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