Why is A[:,i] different from A[:][i]?

A = np.array([


array([1, 4, 7])
array([1, 2, 3])

Im confused by the second output, because it should select : (everything) from the first dimension, so all row vectors. And 0 from the second dimension, the entries of the row vectors, to extract the 0th column vector.

Read more here: https://stackoverflow.com/questions/64944087/why-is-a-i-different-from-ai

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