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joshvm | karma 4608 | avg karma 2.74 · 2016-04-04 11:36:52

I thought it seemed odd that Python supported the AND operator on lists, but it doesn't.

You do need to convert to a set first, e.g.

  [1,2,3] & [1,2]

gives a TypeError, while

  set([1,2,3]) & set([1,2])

gives set([1,2]) as expected.

zenogais | karma 608 | avg karma 2.36 · 2016-04-04 16:59:09+00:00

You can also write sets in a more compact notation in python as:

    {1,2,3} & {1,2}

Which gives {1,2} as a result.

akras14 | karma 2721 | avg karma 5.52 · 2016-04-05 01:21:36+00:00

Thank you for catching this! I did in fact call set on the comments outside of that function. I've updated the blog post.