Python Tutorial — Chapter 9

In this chapter, let us look at the Python set object which is used to store multiple items just as tuples, lists, and dictionaries.

You can declare a set object with one of these methods:-

 set1 = {1,2,3}
 set2 = set((1,2,3))

In order to remove an element from a set, use the remove or discard method as follows:-

 
set1.remove(2) # {1,3}
set1.discard(3) # {1}

In order to remove the front element from a set, use the pop method.

set1.pop() # {2,3}

Insert an element to the end of the set with the add method.

set1.add(5) #{1,2,3,5}

Find the difference between two set elements:-

set1 = {1,2,3}
set2 = set((1,4,6))
set3 = set1.difference(set2) # {2,3}

As you can see this method will subtract the element within two sets based on their index position.

Clear all the elements within a set:-

set1.clear()

Find the common elements within two sets:-

set1 = {1,2,3}
set2 = set((1,4,6))
set3 = set1.intersection(set2) # {1}

Combined all the elements within two sets:-

set1 = {1,2,3}
set2 = set((1,4,6))
set3 = set1.union(set2) # {1,2,3,4,6}

Copy a set of elements into another set:-

set3 = set1.copy() # {1, 2, 3}

Find out whether a set is a subset of another set:-

set1 = {1,2,3}
set2 = set((1,4,6))
set1.issubset(set2) # False

There are still lots of methods that you can read on the official documentation page of Python regarding the set object!