In [] : arr_copy = arr.copy()

In []: aar
Out[]: array([[0, 1, 2],
              [3, 4, 5],
              [6, 7, 8]])

In []: aar.T   or   aar.transpose()
Out[]: array([[0, 3, 6],
       　 　　[1, 4, 7],
     　　　   [2, 5, 8]])

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