[Numpy-discussion] three-dim array

hello, sorry newbe to numpy. I want to define a three-dim array. I know this works:

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np.array([[[1,2],[3,4]],[[5,6],[7,8]]]) array([[[1, 2], [3, 4]],

[[5, 6], [7, 8]]]) But can you tell why this doesnt work?

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np.array([[1,2],[[1,2],[3,4]]]) Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: setting an array element with a sequence.

Thank you.