[Python-Dev] Re: Sets: elt in dict, lst.include
Tue, 23 Jan 2001 19:29:24 -0800 (PST)
> 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.