[Python] Interleaving two NumPy arrays efficiently

Assume the following arrays are given:

a = array([1, 3, 5])
b = array([2, 4, 6])


How would one interleave them efficiently so that one gets a third array like the following?

c = array([1, 2, 3, 4, 5, 6])


It can be assumed that length(a) == length(b).

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