Table of Contents
In this tutorial, we will learn about the Python Set add() method with the help of examples.
The add() method adds a given element to a set. If the element is already present, it doesn’t add any element.
Example
1 2 3 4 5 6 7 8 9 | prime_numbers = {2, 3, 5, 7}# add 11 to prime_numbersprime_numbers.add(11)print(prime_numbers)# Output: {2, 3, 5, 7, 11} |
1. Syntax of Set add()
The syntax of add() method is:
1 | set.add(elem) |
add() method doesn’t add an element to the set if it’s already present in it.
Also, you don’t get back a set if you use add() method when creating a set object.
1 | noneValue = set().add(elem) |
The above statement doesn’t return a reference to the set but ‘None’, because the statement returns the return type of add which is None.
2. Set add() Parameters
add() method takes a single parameter:
- elem – the element that is added to the set
3. Return Value from Set add()
add() method doesn’t return any value and returns None.
4. Example 1: Add an element to a set
1 2 3 4 5 6 7 8 9 10 11 12 | # set of vowelsvowels = {'a', 'e', 'i', 'u'}# adding 'o'vowels.add('o')print('Vowels are:', vowels)# adding 'a' againvowels.add('a')print('Vowels are:', vowels) |
Output
1 2 | Vowels are: {'a', 'i', 'o', 'u', 'e'}Vowels are: {'a', 'i', 'o', 'u', 'e'} |
Note: Order of the vowels can be different.
5. Example 2: Add tuple to a set
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | # set of vowelsvowels = {'a', 'e', 'u'}# a tuple ('i', 'o')tup = ('i', 'o')# adding tuplevowels.add(tup)print('Vowels are:', vowels)# adding same tuple againvowels.add(tup)print('Vowels are:', vowels) |
Output
1 2 | Vowels are: {('i', 'o'), 'e', 'u', 'a'}Vowels are: {('i', 'o'), 'e', 'u', 'a'} |
You can also add tuples to a set. And like normal elements, you can add the same tuple only once.
