def portfolio$\_$intersection$($portfolio$1,$ portfolio$2)$: # Convert the lists to sets set$1=$ set$($portfolio$1)$ set$2=$ set$($portfolio$2)$ # Find the intersection of the two sets intersection $=$ set$1$ & set$2$ # Convert the intersection set back to a list intersection$\_$list $=$ list$($intersection$)$ return intersection$\_$list