pulling set of unique values from a list

[Erik Max Francis]

Ben Davies wrote:

> personally I prefer the dictionary one-liner, but with the second
> iterative
> way it is probably more obvious what the code is doing (and perhaps
> more
> efficient?).

No, the dictionary method is more efficient.  The list-using algorithm
has O(n^2) behavior, whereas the dictionary-using algorithm is only
O(n).

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