li1=set([1,2,3,4])
li2=set([4,5,6,7])
update_set=li1.intersection(li2)
delete_set=li1.symmetric_difference(update_set)
add_set=li2.symmetric_difference(update_set)
print(update_set)
print(delete_set)
print(add_set)
==========
{4}
{1, 2, 3}
{5, 6, 7}
==========
原文：https://www.cnblogs.com/zhucaipeng/p/10822800.html