Mini Quiz II Review Exercises

Which of the statements below are reasons we might iterate over a list by position, rather than by value? Select all that apply.

• To modify the values in a list.

• We never need to iterate by position.

• To make sure we don’t modify the values in a list.

• To iterate over two related lists at the same time

What does the variable new_list contain after the following code runs?

values = [2, 4, 6, 8, 10, 12] new_list = [] for num in values[:3]: new_list.append(num * 2)

What does the variable numbers contain after the following code runs? numbers = [5, 15, 25, 35, 45] for i in range(1, len(numbers)): numbers[i] = numbers[i] + numbers[i - 1]

Which of the following Python snippets is best for calling a function named foo that takes no parameters and returns an int? Select only one option (the best answer) below.

• foo = ()

• foo()

• foo = def()

• result = foo()

What will the following Python code print? def func(p1): x = p1 * 2 return x def main(): x = 4 func(x) print(x * 2) print(func(x * 2)) main()

What will the following Python code print? def big_vals(lst, k): new_lst = [] for num in lst: if num > k: new_lst.append(num) return new_lst def main(): results = big_vals([1, 2, 3, 4, 5], 3) print(results) main()

For the 2D list lst = [[2, 4, 6, 8], [1, 2, 3, 4]], circle all the expressions below that produce no error and access a one-dimensional list.

• lst

• lst[0]

• lst[1]

• lst[1][1]

• lst[2]

What would the code below print to the terminal? lst = [[2, 4, 6, 8], [1, 2, 3, 4]] for i in range(len(lst)): print(lst[i][1])

What would the code below print to the terminal? def count_string(names, s): count = 0 for i in range(len(names)): for j in range(len(names[i])): if names[i][j] == s: count += 1 return count def main(): lst = [["carol", "grizz"], ["carol", "choux"]] name = "carol" print(count_string(lst, name)) main()