Python的集合操作总结

a=set([1,2,3,4,5,6])
b=set([4,5,6,7])
# intersection 交集
#a和b的交集
print(a.intersection(b))#{4, 5, 6}
print(a & b)#{4, 5, 6}
 
# union  并集
print(a.union(b))#{1, 2, 3, 4, 5, 6, 7}
print(a | b)#{1, 2, 3, 4, 5, 6, 7}  等价于a.union(b)
 
#difference 差集
print(a.difference(b))#{1, 2, 3}  in a but not in b
print(a - b)#{1, 2, 3}  in a but not in b
print(b.difference(a))#{7}
print(b - a)#{7}
print(a.symmetric_difference(b))#{1, 2, 3, 7}  symmetric 对称差集 除了交集之外的所有
print(a ^ b)#{1, 2, 3, 7}  symmetric 对称差集 除了交集之外的所有
 
#父集 超集
print(a.issuperset(b))
print(a > b)
#子集
print(a.issubset(b))
print(a < b)