How to use 'numpy harmonic mean' in Python

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58def harmonic_mean(a, weights=None):
59 if any([x == 0 for x in a]):
60 return 0
61 else:
62 assert weights is None or len(weights) == len(a), 'Weights has length {} which is different from that of the array ({}).'.format(len(weights), len(a))
63 if weights is None:
64 return len(a) / sum([1/x for x in a])
65 else:
66 return sum(weights) / sum(w/x for x, w in zip(a, weights))

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