Find common elements in two lists

Using set intersection we can get the common element b/w two list. This is the fast way to get unique common elements, but order is not preserved

list1 = [1, 2, 3, 4]
list2 = [3, 4, 5, 6]

common = list(set(list1) & set(list2))
print(common)  # Output: [3, 4]