Lists

Question 1

A list contains a sequence of elements. Elements in a list can be accessed through an _______.

Answer 1

index.

Question 2

What is an index?

Answer 2

An integer value used to specify the position of an element in the list.

Question 3

What is list("abcd")?
 A. ['a', 'b', 'c', 'd']
 B. ['ab']
 C. ['cd']
 D. ['abcd']

Answer 3

A. [‘a’, ‘b’, ‘c’, ‘d’]

Question 4

What happens when your program attempts to access a list element with an invalid index?

Answer 4

Causes a run time error (index out of range)

Question 5

Suppose list1 is [1, 3, 2, 4, 5, 2, 1, 0], Which of the following is correct?
 A. print(list1[0])
 B. print(list1[:2])
 C. print(list1[:-2])
 D. print(list1[4:6])

Answer 5

A. print(list1[0])
B. print(list1[:2])
C. print(list1[:-2])
D. print(list1[4:6])

Question 6

Suppose list1 is [1, 3, 2], What is list1 * 2?
 A. [2, 6, 4]
 B. [1, 3, 2, 1, 3]
 C. [1, 3, 2, 1, 3, 2]
 D. [1, 3, 2, 3, 2, 1]

Answer 6

C. [1, 3, 2, 1, 3, 2]

Question 7

What is the output of the following code?
lst = [1, 2, 3, 4, 5, 6]

for i in range(1, 6):
lst[i] = lst[i - 1]

print(lst)

Answer 7

[1, 1, 1, 1, 1, 1]

Question 8

Suppose list1 = [1, 2, 3], what is the output of the following code?
  for i in list1:
      print(i * 2, end = '')
 A. 2 4 6
 B. 246
 C. [2, 4, 6]
 D. 2, 4, 6

Answer 8

B. 246

Question 9

list1 = [11, 2, 23] and list2 = [2, 11, 23], list1 == list2 is ________
A. True
B. False

Answer 9

B. False

Question 10

myList = [1, 5, 5, 5, 5, 1]
max = myList[0]
indexOfMax = 0
for i in range(1, len(myList)):
    if myList[i] > max:
        max = myList[i]
        indexOfMax = i

print(indexOfMax)
 A. 0
 B. 1
 C. 2
 D. 3
 E. 4

Answer 10

B. 1

Question 11

What will be displayed by the following code?

myList = [1, 2, 3, 4, 5, 6]
for i in range(1, 6):
myList[i - 1] = myList[i]

for i in range(0, 6): 
    print(myList[i], end = " ")
 A. 2 3 4 5 6 1
 B. 6 1 2 3 4 5
 C. 2 3 4 5 6 6
 D. 1 1 2 3 4 5
 E. 2 3 4 5 6 1

Answer 11

C. 2 3 4 5 6 6

Hint: The elements in myList are shifted one space left.

Question 12

What will be displayed by the following code?

def f(values):
    values[0] = 44

v = [1, 2, 3]
f(v)
print(v)
 A. [1, 44]
 B. [1, 2, 3, 44]
 C. [44, 2, 3]
 D. [1, 2, 3]

Answer 12

C. [44, 2, 3]

Question 13

What will be displayed by the following code?

def f(value, values):
    v = 1
    values[0] = 44

t = 3
v = [1, 2, 3]
f(t, v)
print(t, v[0])
 A. 1 1
 B. 1 44
 C. 3 1
 D. 3 44

Answer 13

D. 3 44

Question 14

What will be displayed by the following code?

def f(i, values = []):
    values.append(i)
    return values

f(1)
f(2)
v = f(3)
print(v)
 A. [1] [2] [3]
 B. [1] [1, 2] [1, 2, 3]
 C. [1, 2, 3]
 D. 1 2 3

Answer 14

C. [1, 2, 3]

Question 15

If a key is not in the list, the binarySearch function returns \_\_\_\_\_\_\_\_\_.
 A. insertion point
 B. insertion point - 1
 C. -(insertion point + 1)
 D. -insertion point

Answer 15

C. -(insertion point + 1)

Question 16

If the binary search function returns -4, where should the key be inserted if you wish to insert the key into the list?
 A. at index 3
 B. at index 4
 C. at index 5
 D. at index 6

Answer 16

A. at index 3

Question 17

Use the selectionSort function presented in this section to answer this question. What is list1 after executing the following statements?

list1 = [3.1, 3.1, 2.5, 6.4]
selectionSort(list1)
 A. list1 is 3.1, 3.1, 2.5, 6.4
 B. list1 is 2.5 3.1, 3.1, 6.4
 C. list1 is 6.4, 3.1, 3.1, 2.5
 D. list1 is 3.1, 2.5, 3.1, 6.4

Answer 17

B. list1 is 2.5 3.1, 3.1, 6.4

Question 18

You can use the ________ function in the random module to shuffle the elements in a list.

Answer 18

shuffle