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Showing content from https://www.tutorialspoint.com/python/python_set_remove_method.htm below:

Python Set remove() method

The Python Set remove() method is used to remove a specified element from the set. If the element is present in the set then it removes it. If the element is not found then it raises a KeyError exception.

The discard() method which also removes an element but does not raise an error if the element is missing where as the remove() method ensures that the specified element must exist in the set.

This method is useful when we need to enforce the presence of an element before removing it by ensuring the set's integrity by handling unexpected missing elements explicitly.

Following is the syntax and parameters of Python Set remove() method.

set.remove(element)

This method accepts only one parameter i.e. element , which the element to be removed from the set if present.

This method does not return any value.

Following is the example which shows how to remove an element that exists in the set −

# Define a set
my_set = {1, 2, 3, 4, 5}

# Remove an element
my_set.remove(3)

print(my_set)  

{1, 2, 4, 5}

This example is trying to remove an element that doesn't exist in the set and raises a KeyError −

# Define a set
my_set = {1, 2, 3}

# Try to remove a non-existing element
try:
    my_set.remove(4)
except KeyError as e:
    print(f"Error: {e}")  

Error: 4

Now, in here we use a loop to remove multiple elements from a set.

# Define a set
my_set = {1, 2, 3, 4, 5}

# Remove multiple elements
elements_to_remove = {2, 4}
for elem in elements_to_remove:
    my_set.remove(elem)

print(my_set)  

{1, 3, 5}

In this example we use list comprehension and define the condition in list comprehension to remove elements based on that condition −

# Define a set
my_set = {1, 2, 3, 4, 5}

# Remove elements greater than 3
my_set = {elem for elem in my_set if elem <= 3}

print(my_set) 

{1, 2, 3}

python_set_methods.htm

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