The Python Apprentice

Removing elements from sets

Two methods are provided for removing elements from sets. The first, remove(), requires that the element to be removed is present in the set, otherwise a KeyError is given:

>>> k.remove(97)>>> k{128, 81, 37, 54, 12, 108}>>> k.remove(98)Traceback (most recent call last):  File "<stdin>", line 1, in <module>KeyError: 98

The second method, discard(), is less fussy and simply has no effect if the element is not a member of the set:

>>> k.discard(98)>>> k{128, 81, 37, 54, 12, 108}