Python Set add()
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
prime_numbers = {2, 3, 5, 7}
# add 11 to prime_numbers
prime_numbers.add(11)
print(prime_numbers)
# Output: {2, 3, 5, 7, 11}
Syntax of Set add()
The syntax of add() method is:
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.
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.
Set add() Parameters
add() method takes a single parameter:
- elem - the element that is added to the set
Return Value from Set add()
add() method doesn't return any value and returns None.
Example 1: Add an element to a set
# set of vowels
vowels = {'a', 'e', 'i', 'u'}
# adding 'o'
vowels.add('o')
print('Vowels are:', vowels)
# adding 'a' again
vowels.add('a')
print('Vowels are:', vowels)
Output
Vowels are: {'a', 'i', 'o', 'u', 'e'}
Vowels are: {'a', 'i', 'o', 'u', 'e'}
Note: Order of the vowels can be different.
Example 2: Add tuple to a set
# set of vowels
vowels = {'a', 'e', 'u'}
# a tuple ('i', 'o')
tup = ('i', 'o')
# adding tuple
vowels.add(tup)
print('Vowels are:', vowels)
# adding same tuple again
vowels.add(tup)
print('Vowels are:', vowels)
Output
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.
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