# 30 seconds of python

Back to Home#### intersection

listbeginnerReturns a list of elements that exist in both lists.

Create a `set`

from `a`

and `b`

, then 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)