Topic 7 - List Type in Python

Question 1

Are lists mutable or immutable?

Answer 1

Lists are mutable, i.e. the contents can be changed.

Question 2

What code is used to create an empty list?

Answer 2

empty_list = list()

Question 3

What two operators can be used to test if something is in a list or not?

Answer 3

1. ) in

2. ) not in

Question 4

Explain what is happening with the following code.

empty_list = list()
empty.list.append(5)

Answer 4

First, a empty list variable is created.

Then, the value of 5 is added to the list. If other existing elements existed, the value of 5 would be added to the end of the list.

Question 5

How would you remove the last element in a list?

Answer 5

Use the pop method.

last_elem = empty.list.pop()

Question 6

How would you add the elements of one list to another, WITHOUT, creating a list within a list, what operator would you use?

Answer 6

Use the extend method.

empty_list.extend( [6,7] )

Question 7

How would you remove specific elements from a list using the pop method, for example, the first element?

Answer 7

first_elem = empty_list.pop(0)

Question 8

What method is used to add a specific element to a list at a specific position?

Answer 8

empty_list.insert(0, 10)

In the example above, the value of 10 would be added at index zero.

Question 9

How would you remove a certain value from a list, for example, the value of 7?

Answer 9

empty_list.remove(7)

Question 10

What method is used to remove all values from a list?

Answer 10

empty_list.clear()