How to repeat elements of an array along two axes?

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You could use the Kronecker product, see numpy.kron:

>>> a = np.arange(12).reshape(3,4)
>>> print(np.kron(a, np.ones((2,2), dtype=a.dtype)))
[[ 0  0  1  1  2  2  3  3]
 [ 0  0  1  1  2  2  3  3]
 [ 4  4  5  5  6  6  7  7]
 [ 4  4  5  5  6  6  7  7]
 [ 8  8  9  9 10 10 11 11]
 [ 8  8  9  9 10 10 11 11]]

Your original method is OK too, though!

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