Python 3 reference · Set Methods

Python Set discard() Method

Remove an element if it is present; do nothing if it isn't. The no-error version of remove().

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Syntax

set.discard(elem)

Parameter	Description
`elem`	The element to remove.

None.

Remove safelyTry it yourself

s = {"a", "b"}
s.discard("a")
s.discard("z")  # no error
print(s)

Output

{'b'}

Compared with remove()Try it yourself

s = {1}
try:
    s.remove(2)
except KeyError:
    print("remove() raises KeyError")

Output

remove() raises KeyError

Version	Change
Python 3.0	Added

set.remove() · Remove an element from the set. Raises KeyError if it isn't present; use discard() to avoid the error.
set.pop() · Remove and return an arbitrary element of the set. Raises KeyError if the set is empty.
list.remove() · Remove the first item equal to a value. Raises ValueError if the value is not in the list.
Python Sets · tutorial