#!/usr/bin/env python3 l1 = ['','','','']
l2 = ['','','',''] # 交集
result1 = [i for i in l1 if i in l2]
result2 = list(set(l1).intersection(set(l2)))
print(result1)
print(result2) # 并集
result3 = list(set(l1).union(set(l2)))
print(result3) # 差集
# 元素在 l1 不在 l2
result4 = list(set(l1).difference(set(l2)))
print(result4)