set.intersection_update() Intersection update
Last updated: 2026-09-22
set.intersection_update() Intersection update
set.intersection_update(*others) keeps only elements also found in all others.
| Category | Set Methods |
|---|---|
| Kind | Built-in Type Method |
| Python Version | all |
📝 Syntax
set.intersection_update(*others)⚙️ Parameters
| others Optional | Zero or more iterables; can be omitted. |
|---|
Returns：None (keeps only elements also found in all of the others).
Mutates the original：Yes (in place)
▶ Example
Edit the code, press Run, and see the result in the output panel:
Output：
{2, 3}💡 Related Cases
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❓ FAQ
QWhat does intersection_update() do?
AIt transforms the set in place into its intersection with all others, returning None. This is the opposite of intersection(), which returns a new set.
QWhat happens when there are no common elements?
AThe set is emptied to set(), without raising an error.
QWhat is the difference from &=?
AEquivalent, but &= requires the right side to be a set; intersection_update() accepts any iterable.
