Python 3 reference · Set Methods

Python Set remove() Method

Remove an element from the set. Raises KeyError if it isn't present; use discard() to avoid the error.

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Syntax

set.remove(elem)

Parameter	Description
`elem`	The element to remove.

None.

Remove an elementTry it yourself

s = {"a", "b"}
s.remove("a")
print(s)

Output

{'b'}

Missing elements raise KeyErrorTry it yourself

s = {"a"}
try:
    s.remove("z")
except KeyError as e:
    print("KeyError:", e)

Output

KeyError: 'z'

Version	Change
Python 3.0	Added

set.discard() · Remove an element if it is present; do nothing if it isn't. The no-error version of remove().
set.pop() · Remove and return an arbitrary element of the set. Raises KeyError if the set is empty.
Python Sets · tutorial