python 交集，并集，补集

l1 = [1, 2, 3, 4, 5]
l2 = [3, 4, 5, 6, 7]
s1 = set(l1)
s2 = set(l2)
print(s1.__class__)  # 
print(s1 and s2)  # {3, 4, 5, 6, 7}
print(s2 and s1)  # {1, 2, 3, 4, 5}
print(s1 or s2)  # {1, 2, 3, 4, 5}
print(s2 or s1)  # {3, 4, 5, 6, 7}
print(s1 & s2)  # {3, 4, 5}交集
print(s1 | s2)  # {1, 2, 3, 4, 5, 6, 7}并集
print(s1 - s2)  # {1, 2}补集
print(s2 - s1)  # {6, 7}
print(s1 ^ s2)  # {1, 2, 6, 7}并集-交集
print(s2 ^ s1)  # {1, 2, 6, 7}