Memory mixed review

Questions 1 to 5 of 6

1. 1. What does this program print? ``python import copy a = [[1], [2]] b = a[:] c = copy.deepcopy(a) a[0].append(9) print(b, c) ``

   [[1], [2]] [[1], [2]][[1, 9], [2]] [[1, 9], [2]][[1], [2]] [[1, 9], [2]][[1, 9], [2]] [[1], [2]]
2. 2. What does this program print? ``python rows = 3 cols = 4 flat = [0] * (rows * cols) for r in range(rows): for c in range(cols): flat[r * cols + c] = r * 10 + c r = 0 c = 1 print(flat[r * cols + c], 'then', flat[c * cols + r]) ``

   1 then 41 then 1010 then 10 then 10
3. 3. A list holds 1 -> 2 -> 3. head refers to node 1, and b refers to node 2. The code below runs. What happens to node 2? ``python head.next = head.next.next ``

   It stays in memory, because b still reaches it, and it still points at node 3It is freed at once, because no arrow from head reaches it any moreIts value is copied into node 1, so node 2 is no longer neededIt is moved to the end of the list, after node 3
4. 4. The variable name may be None. Which line is safe to run when name is None?

   name.lower() == 'ana'len(name) == 3name is not None and name.lower() == 'ana'name.strip() == 'Ana'
5. 5. Match each Python exception to what it means.

   Choose the matching item for each row.

   AttributeErrorChoose…an index was outside 0 to len minus 1an operation was applied to a value of a type that does not support it, such as `None + 1`the chain of calls went deeper than the recursion limita method or attribute was read from a value that does not have it, such as `None`IndexErrorChoose…an index was outside 0 to len minus 1an operation was applied to a value of a type that does not support it, such as `None + 1`the chain of calls went deeper than the recursion limita method or attribute was read from a value that does not have it, such as `None`RecursionErrorChoose…an index was outside 0 to len minus 1an operation was applied to a value of a type that does not support it, such as `None + 1`the chain of calls went deeper than the recursion limita method or attribute was read from a value that does not have it, such as `None`TypeErrorChoose…an index was outside 0 to len minus 1an operation was applied to a value of a type that does not support it, such as `None + 1`the chain of calls went deeper than the recursion limita method or attribute was read from a value that does not have it, such as `None`