> min(a) This does not return a negative minimum on input [1] (because there is none).
> and
>
> min([e for e in a if e >=0]
This does not return a positive minimum on input [0] (because there is none).
I would have said:
pos_min = min(e for e in a if e > 0)
neg_min = min(e for e in a if e < 0)
And then deal with the ValueError when there is no such minimum, as appropriate.
-- Devin
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