why in returns values for array and keys for dictionary

[Erik Max Francis]

++imanshu wrote:

>     Wouldn't it be nicer to have 'in' return values (or keys) for both
> arrays and dictionaries. Arrays and Dictionaries looked so similar in
> Python until I learned this difference.

It's because dealing with keys makes far more sense, since that's how 
the dictionary data structure works.  If you're doing this an awful lot 
-- whether testing for inclusion or iterating -- then you're probably 
using the wrong data structure.

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