Removing Elements from the Set in Python
Below are some of the ways by which we can remove elements from the set in Python:
- Using remove() Method or discard() Method
- Using pop() Method
- Using clear() Method
Using remove() Method or discard() Method
Elements can be removed from the Sets in Python by using the built-in remove() function but a KeyError arises if the element doesn’t exist in the hashset Python. To remove elements from a set without KeyError, use discard(), if the element doesn’t exist in the set, it remains unchanged.
# Creating a Set
set1 = set([1, 2, 3, 4, 5, 6,
7, 8, 9, 10, 11, 12])
print("Initial Set: ")
print(set1)
# Removing elements from Set using Remove() method
set1.remove(5)
set1.remove(6)
print("\nSet after Removal of two elements: ")
print(set1)
# Removing elements from Set using Discard() method
set1.discard(8)
set1.discard(9)
print("\nSet after Discarding two elements: ")
print(set1)
# Removing elements from Set using iterator method
for i in range(1, 5):
set1.remove(i)
print("\nSet after Removing a range of elements: ")
print(set1)
Output
Initial Set:
{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}
Set after Removal of two elements:
{1, 2, 3, 4, 7, 8, 9, 10, 11, 12}
Set after Discarding two elements:
{1, 2, 3, 4, 7, 10, 11, 12}
Set after Removing a range of elements:
{7, 10, 11, 12}Using pop() Method
Pop() function can also be used to remove and return an element from the set, but it removes only the last element of the set.
Note: If the set is unordered then there’s no such way to determine which element is popped by using the pop() function.
# Python program to demonstrate
# Deletion of elements in a Set
# Creating a Set
set1 = set([1, 2, 3, 4, 5, 6,
7, 8, 9, 10, 11, 12])
print("Initial Set: ")
print(set1)
# Removing element from the
# Set using the pop() method
set1.pop()
print("\nSet after popping an element: ")
print(set1)
Output
Initial Set:
{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}
Set after popping an element:
{2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}Using clear() Method
To remove all the elements from the set, clear() function is used.
#Creating a set
set1 = set([1,2,3,4,5])
print("\n Initial set: ")
print(set1)
# Removing all the elements from
# Set using clear() method
set1.clear()
print("\nSet after clearing all the elements: ")
print(set1)
Output
Initial set:
{1, 2, 3, 4, 5}
Set after clearing all the elements:
set()Python Sets
Python Set is an unordered collection of data types that is iterable, mutable, and has no duplicate elements. The order of elements in a set is undefined though it may consist of various elements. The major advantage of using a set, as opposed to a list, is that it has a highly optimized method for checking whether a specific element is contained in the set. Here, we will see what is a set in Python and also see different examples of set Python.