交集 并集python

以下是Python中求交集和并集的示例代码：

1. 求交集：

list1 = [1, 2, 3, 4, 5]
list2 = [4, 5, 6, 7, 8]
set1 = set(list1)
set2 = set(list2)
intersection = set1.intersection(set2)
print("交集：", intersection)  # 输出：{4, 5}

2. 求并集：

list1 = [1, 2, 3, 4, 5]
list2 = [4, 5, 6, 7, 8]
set1 = set(list1)
set2 = set(list2)
union = set1.union(set2)
print("并集：", union)  # 输出：{1, 2, 3, 4, 5, 6, 7, 8}