python list 数据比较

#!/usr/bin/python
# -*- coding: utf-8 -*-
list1=['a','b','c','d']
list2=['c','d','e','f']

set1=set(list1)
set2=set(list2)


# 交集
print '\n交集:'
print set1 & set2

# 并集
print '\n并集:'
print set1 | set2

# 差集
print '\n差集:'
print set1 - set2
print set2 - set1

# 对称差集
print '\n对称差集:'
print set1 ^ set2
print set2 ^ set1


# 子集 & 超集
set3 = set(['a','b','c'])
print set3.issubset(set1) # set3是set1的子集
print set3.issubset(set2) # set3是set2的超集

交集:
set(['c', 'd'])

并集:
set(['a', 'c', 'b', 'e', 'd', 'f'])

差集:
set(['a', 'b'])
set(['e', 'f'])

对称差集:
set(['a', 'b', 'e', 'f'])
set(['a', 'b', 'e', 'f'])
True
False