如何找到 python 中两个集合的 AND 运算的余数

Question

I have two sets of countries, one of which is longer, and I'm trying to find the entries that don't feature in both lists.

(set(a) & set(b) this code gave me the entries that appear in both. Not(set(a) & set(b)) just returned false. I'm looking for a list

Answer 1

In set theory, this is known as the symmetric difference , and in Python, sets have a symmetric_difference method , so you could use

set(a).symmetric_difference(set(b))

or, as shorthand

set(a) ^ set(b)