Python Set pop() Method - Learn By Example

Removes and returns a random item from the set

Usage

The pop() method removes random item from a set and returns it. If the set is empty, the method raises KeyError.

If you want to remove a specific item, use remove() or discard() method.

set.pop()

# Remove random item from a set
S = {'red', 'green', 'blue'}
S.pop()
print(S)
# Prints {'green', 'red'}

When you remove an item from the set using pop(), it removes it and returns its value.

S = {'red', 'green', 'blue'}
x = S.pop()
print(x)
# Prints blue

pop() method raises KeyError on empty set.

S = set()
S.pop()
# Triggers KeyError: 'pop from an empty set'