Introduction Python Set Discard() Method with Examples

Introduction  Python Set Discard() Method with Examples

The discard() method in Python removes a specified element from the Set. It works same as remove() method, however there is a difference between remove() and discard() method. The remove() method raises an error when the specified element doesn’t exist in the given set, however the discard() method doesn’t raise any error if the specified element is not present in the set and the set remains unchanged.

The discard() method in Python removes a specified element from the Set. It works same as remove() method, however there is a difference between remove() and discard() method. The remove() method raises an error when the specified element doesn’t exist in the given set, however the discard() method doesn’t raise any error if the specified element is not present in the set and the set remains unchanged.

Python Set discard()

Syntax

set.discard(item)

Parameter: Here item is the element which we want to remove the set.
Return value: This method doesn’t return anything.

Let's see some examples of discard() method to understand it's functionality.

Example 1

A simple example to use discard method to remove an element.


# Python set discard() Method  
# Creating a set  
set = {1,2,3,4,5}  
# Displaying elements  
print(set)   
# Calling function  
set.discard(2)  
print(set)  

Output:

{1, 2, 3, 4, 5}
{1, 3, 4, 5}

Example 2

If the element is not present it returns none to the caller method.


# Python set discard() Method  
# Creating a set  
set = {1,2,3,4,5}  
# Displaying elements  
print(set)   
# Calling function  
val = set.discard(22)  
print(val)  

Output:


{1, 2, 3, 4, 5}
None

Example 3

An example where we are implementing this method into a program. It removes all odds elements.

# Python set discard() Method  
# Creating a set  
set = {1,2,3,4,5}  
set2 = {1,2,3,4,5}  
# Displaying elements  
print(set)   
# Calling function  
for s in set2:  
    if s%2!=0:  
        set.discard(s)  # Discard all odd elements  
print(set)  

Output:

{1, 2, 3, 4, 5}
{2, 4}

As you can see in the output that no errors were raised and the set remained unchanged when we tried to remove an element from the set which was not present.

Thanks for reading !

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