find difference in two lists code example

Example 1: 2 list difference python

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

set_difference = set(list1) - set(list2)
list_difference = list(set_difference)

print(list_difference)

#result
[1,2]

Example 2: get list of words that are in two lists using set

list1 = ['little','blue','widget']
list2 = ['there','is','a','little','blue','cup','on','the','table']

list3 = set(list1)&set(list2) # we don't need to list3 to actually be a list

list4 = sorted(list3, key = lambda k : list1.index(k))