when summing integers, use numpy.sum. #537
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On some occasions when code is ran in e.g. a notebook, numpy.sum is imported to replace sum, and the behaviro of numpy.sum([]) is to 0.0 rather than builtin.sum([]) which returns 0. numpy.sum([]) returning 0.0 causes downstream code expecting integers to fail, thus copying the code out of nbodykit won't work. We shall not serve as an poor example in this context.
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On some occasions when code is ran in e.g. a notebook,
numpy.sum is imported to replace sum, and the behaviro of
numpy.sum([]) is to 0.0 rather than builtin.sum([]) which returns 0.
numpy.sum([]) returning 0.0 causes downstream code expecting integers to fail,
thus copying the code out of nbodykit won't work.
We shall not serve as an poor example in this context.