++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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