30-seconds-of-code/python/s/intersection.md

title, type, language, tags, cover, dateModified

title	type	language	tags	cover	dateModified
List intersection	snippet	python	list	wooden-bowl	2020-11-02T19:28:05+02:00

Returns a list of elements that exist in both lists.

• Create a set from a and b.
• Use the built-in set operator & to only keep values contained in both sets, then transform the set back into a list.

def intersection(a, b):
  _a, _b = set(a), set(b)
  return list(_a & _b)

intersection([1, 2, 3], [4, 3, 2]) # [2, 3]