Sets

Question 1

Definition of a set

Answer 1

A set is a unique collection of objects in Python. You can denote a set with a curly bracket {}. Python will automatically remove duplicate items:

Question 2

Convert list to set will remove duplicate items

Answer 2

album_list = [“Michael Jackson”, “Thriller”, 1982, “00:42:19”, \
“Pop, Rock, R&B”, 46.0, 65, “30-Nov-82”, None, 10.0]
album_set = set(album_list)
album_set

Question 3

Add an element using add()

Answer 3

A.add(“NSYNC”)
A
{‘AC/DC’, ‘Back in Black’, ‘NSYNC’, ‘Thriller’}

Question 4

Remove an element

Answer 4

A.remove(“NSYNC”)

A

Question 5

We can verify if an element is in the set using the in command:

Answer 5

“AC/DC” in A

True

Question 6

Find intersection of 2 sets

Answer 6

You can find the intersect of two sets as follow using &:
intersection = album_set1 & album_set2
intersection
{‘AC/DC’, ‘Back in Black’}

Question 7

You can find all the elements that are only contained in album_set1 using the difference method:

Answer 7

album_set1.difference(album_set2)

{‘Thriller’}

Question 8

The elements in album_set2 but not in album_set1 is given by:

Answer 8

album_set2.difference(album_set1)

{‘The Dark Side of the Moon’}

Question 9

Union of 2 albums

Answer 9

album_set1.union(album_set2)

{‘AC/DC’, ‘Back in Black’, ‘The Dark Side of the Moon’, ‘Thriller’}

Question 10

And you can check if a set is a superset or subset of another set, respectively, like this:

Answer 10

set(album_set1).issuperset(album_set2)

False