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how to average only positive number in array numpy

a = [[1, 2, 3, -1, -2, -3, -4, -1, 1, 2, 1, 2, 3, 2, 5],
     [1, 2, 3, -1, -2, -3, -4, -1, 1, 2, 1, 2, 3, 2, 5],
     [1, 2, 3, -1, -2, -3, -4, -1, 1, 2, 1, 2, 3, 2, 5]]

b = np.array(a)

def avg(a):
    return a[a > 0].mean()

np.apply_along_axis(avg, 1, b)
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