>>> matrix[1] [4, 5, 6]
>>> matrix[1][1] 5
>>> matrix[2][0] 7
>>> matrix = [[1, 2, 3],
... [4, 5, 6],
... [7, 8, 9]]
>>> matrix[1][1]
With one index, you get an entire row (really, a nested sublist), and with two, you get an item within the row
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