[Numpy-discussion] Picking rows with the first (or last) occurrence of each key

[Skip Montanaro]

> 1. This is not a NumPy question; StackExchange would be more appropriate.

Thanks, that is the fairly straightforward -- but slow -- solution, which I
have already implemented. I was asking if numpy had some filtering functions
which might speed things up (it's a huge library, with which I'm not
terribly familiar). It's fine if the answer is "no".