[Numpy-discussion] Is a Python function a gufunc if it broadcasts its arguments appropriately?

[john.a.dawson--- via NumPy-Discussion]

For example, is the function `stack` below a gufunc with signature (),()->(2)?

def stack(a, b):
    broadcasts = np.broadcast_arrays(a, b)
    return np.stack(broadcasts, axis=-1)

Or must gufuncs be written in C? Or are other things required?
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