Python: Remove items from Python set

Last update on April 21 2025 13:04:16 (UTC/GMT +8 hours)

4. Remove Item(s) from a Given Set

Write a Python program to remove item(s) from a given set.

Visual Presentation:

Sample Solution-1:

Python Code:

Remove single element from a given set:

# Create a set 'num_set' with the elements 0, 1, 3, 4, and 5 using a list:
num_set = set([0, 1, 3, 4, 5])

# Print a message to indicate the original set:
print("Original set:")

# Print the contents of the 'num_set':
print(num_set)

# Remove and return the first element from 'num_set' using the 'pop' method:
num_set.pop()

# Print a message to indicate the set after removing the first element:
print("\nAfter removing the first element from the said set:")

# Print the updated 'num_set' without the first element:
print(num_set) 

Sample Output:

Original set:
{0, 1, 3, 4, 5}

After removing the first element from the said set:
{1, 3, 4, 5}

Sample Solution-2:

Python Code:

Remove all elements from a given set:

# Define a function 'remove_all_elements' that takes a set 'num_set' as an argument:
def remove_all_elements(num_set):
    # Use a 'while' loop to remove elements from 'num_set' as long as it is not empty:
    while num_set:
        num_set.pop()
    # Return the empty 'num_set' after removing all elements:
    return num_set

# Create a set 'num_set' with the elements 0, 1, 3, 4, and 5 using a list:
num_set = set([0, 1, 3, 4, 5])

# Print a message to indicate the original set:
print("Original set:")

# Print the contents of the 'num_set':
print(num_set)

# Print a message to indicate the set after removing all elements:
print("\nAfter removing all elements from the said set:")

# Call the 'remove_all_elements' function to remove all elements from 'num_set' and print the resulting set (should be empty):
print(remove_all_elements(num_set)) 

Sample Output:

Original set:
{0, 1, 3, 4, 5}

After removing all elements from the said set:
set() 

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to remove a list of specified elements from a set using the difference_update() method.
• Write a Python program to delete items from a set that are less than a given threshold.
• Write a Python program to iterate over a set and remove any element that meets a particular condition using set comprehension.
• Write a Python program to remove elements from a set using a loop and the discard() method, then print the resulting set.

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