Lists

Question 1

What is a list?

Answer 1

a collection of items in a particular order

Question 2

Access the first element of the list ‘name_list’

Answer 2

name_list[0]

Question 3

Access the last item in the list ‘name_list’

Answer 3

name_list[-1]

Question 4

Change the third item of the list ‘name_list’

Answer 4

name_list[2] = ‘George’

Question 5

Append a new item at the end of ‘name_list’

Answer 5

name_list.append(“Mary”)

Question 6

Add a new item in the list ‘name_list’ in the fourth position

Answer 6

name_list.insert(3, “Francesco”)

Question 7

When you use the .insert() method on a list, what happens to all the values that come after the inserted value?

Answer 7

They are all shifted one position to the right

Question 8

Remove the 5th item from ‘name_list’

Answer 8

del name_list[4]

Question 9

Remove the last item from ‘name_list’ and assign it to variable ‘user’

Answer 9

user = name_list.pop()

Question 10

Remove first item from ‘name_list’ and assign it to variable ‘user’

Answer 10

user = name_list(0)

Question 11

Remove user “George” from ‘name_list’ and assign it to variable ‘user’

Answer 11

user = name_list.remove(“George”)

Question 12

Order the items of ‘name_list’ alphabetically and then reverse the order

Answer 12

name_list.sort()

name_list.sort(reverse=True)

Question 13

Display the items in ‘name_list’ in alphabetical order without actually changing the order of the list

Answer 13

print(sorted(name_list))

Question 14

Reverse the order of the items in list ‘name_list’

Answer 14

name_list.reverse()

Question 15

Get the number of items in list ‘name_list’

Answer 15

len(name_list)

Question 16

Print all the items in list ‘name_list’

Answer 16

for name in name_list:

print(name)

Question 17

Print numbers from 1 to 5 on separate lines

Answer 17

for value in range(1, 6):

print(value)

Question 18

Print every other value from 1 to 10 on separate lines

Answer 18

for value in range(1, 11, 2):

print(value)

Question 19

Create a list of numbers from 1 to 20 and assign it to ‘numbers’

Answer 19

numbers = list(range(1, 21))

Question 20

What is a list comprehension?

Answer 20

A list comprehension combines the for loop and the creation of new elements into one line, and automatically appends each new element

Question 21

Create a list of squares for each number ranging from 1 to 10, and assign it to variable ‘squares’

Answer 21

squares = [value ** 2 for value in range(1, 11)]

Question 22

What is slicing?

Answer 22

Slicing is the extraction of a part of a string, list, or tuple. It enables users to access the specific range of elements by mentioning their indices. (source: simplilearn.com)

Question 23

Make a slice of the first 5 items in ‘name_list’ and assign it to ‘first_users’

Answer 23

first_users = name_list[0:5]

Question 24

Make a slice of the last 5 items in ‘name_list’ and assign it to ‘last_users’

Answer 24

last_users = name_list[-5:]

Question 25

Print the last 3 items in ‘name_list’ on separate lines

Answer 25

for name in name_list[-3:]:

print(name)

Question 26

Make a copy of ‘name_list’ and call it ‘users’

Answer 26

users = name_list[:]

Question 27

What is a tuple?

Answer 27

A tuple is a list that cannot be changes (is immutable)

Question 28

Define a tuple named ‘length’ with only one element (120).

Answer 28

length = (120, )
#notice the trailing comma, which is mandatory

Question 29

Get the last value in tuple ‘length’ and assign it to “closet”

Answer 29

closet = length[-1]

Question 30

Can you modify the items of a tuple?

Answer 30

You can’t modify a tuple, but you can assign a new value to a variable that represents a tuple.