Jagged arrays and copies

Questions 1 to 5 of 6

1. 1. What does this program print? ``python def deep_copy(source): return [row[:] for row in source] a = [[1, 2], [3, 4, 5]] b = deep_copy(a) a[1][2] = 0 print(b[1][2]) ``

   2504
2. 2. What does this program print? ``python x = [[1], [2]] y = [[1], [2]] print(x == y, x[0] is y[0]) ``

   True FalseFalse TrueTrue TrueFalse False
3. 3. True or false: after grid = [None] * 3, the value of grid[1] is None.

   False, because [None] * 3 makes three empty listsTrue, because [None] * 3 fills three slots with None, and each one stays None until you put a list in it
4. 4. True or false: after c = a.copy(), setting c[1][1] = 0 leaves a[1][1] unchanged.

   True, because copy() copies every row of the listFalse, because copy() copies only the outer list, so both lists share the same row lists
5. 5. What does this program print? ``python shared = [[0, 0]] * 2 shared[0][1] = 9 print(shared) ``

   [[0, 9], [0, 0]][[9, 0], [0, 0]][[0, 0], [0, 9]][[0, 9], [0, 9]]