python集合set,交集,并集,差集,对称差集,子集和超集
x = {1, 2, 3, 4} y = {2, 4, 5, 6} # 交集(取x中与y中相同部分) print(x.intersection(y)) print(x & y) # 并集(去重合并) print(x.union(y)) print(x | y) # 差集(x在y中不同部分,相反) print(x.difference(y)) # {1, 3} print(y.difference(x)) # {5,6} print(x - y) print(y - x) # 补(对称差集) 两个分别差集之后合并为一个集合 print(x.symmetric_difference(y)) print(y.symmetric_difference(x)) print(x ^ y) print(y ^ x) # 子集和超集 :超集长的中包含短的。子集,短的在长的中 print(x.issubset(y)) print(y.issuperset(x))
结果请对号入座:
x.intersection(y):{2, 4} x & y:{2, 4} x.union(y):{1, 2, 3, 4, 5, 6} x | y:{1, 2, 3, 4, 5, 6} x.difference(y):{1, 3} y.difference(x):{5, 6} x - y:{1, 3} y - x:{5, 6} x.symmetric_difference(y):{1, 3, 5, 6} y.symmetric_difference(x):{1, 3, 5, 6} x ^ y:{1, 3, 5, 6} y ^ x:{1, 3, 5, 6} x.issubset(y):False y.issuperset(x):False