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Removing elements from a set in Python

Operations
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Set Operations
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schedule Jul 1, 2022
Last updated
local_offer Python
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We can remove an element from a set in Python using either the discard(~) method or the remove(~) method. The discard(~) method does not raise an exception if the element we try to remove is not present in the set, while the remove(~) method will.

Examples

Removing a single element

Discard method

Removing the element 3 from set a:

a = {1, 2, 3}
a.discard(3)
{1, 2}

No exception is raised if the element we try to remove does not exist:

a = {1, 2, 3}
a.discard(4)
print(a)
{1, 2, 3}

Remove method

Removing the element 3 from set a:

a = {1, 2, 3}
a.remove(3)
{1, 2}

An exception is raised if the element we try to remove does not exist:

a = {1, 2, 3}
a.remove(4) # Causes an error!
---------------------------------------------------------------------------
KeyError Traceback (most recent call last)

Removing multiple elements

To remove multiple elements, use the different_update(~) method:

set_of_num = set([5,3,1])
to_delete = [1,2,4,5]
set_of_num.difference_update(to_delete)
print(set_of_num)
{3}

Equivalently, we can use the - operator with another set:

set_of_num = set([5,3,1])
to_delete = set([1,2,4,5])
print(set_of_num - to_delete)
{3}
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Published by Arthur Yanagisawa
Edited by 0 others
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