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Python Question: In [76]: arr3d = np.array([[[1, 2, 3], [4, 5, 6]], [[7, 8, 9], [10,...

Python Question:

In [76]: arr3d = np.array([[[1, 2, 3], [4, 5, 6]], [[7, 8, 9], [10, 11, 12]]])

In [77]: arr3d
Out[77]: 
array([[[ 1,  2,  3],
        [ 4,  5,  6]],
       [[ 7,  8,  9],
        [10, 11, 12]]])
In [78]: arr3d[0]
Out[78]: 
array([[1, 2, 3],
       [4, 5, 6]])

Can someone tell me why arr3d[0] is a  2 × 3 array?

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