python 集合

# python集合
a = "sdasdasda"
a1 = set(a)#把a变成集合（自动去重）
print(a1)
b = {"a","b","c"}
d = "befghj"
d = set(d)

print(b&d)#交集
print(b|d)#并集
print(b-d)#差集