这段代码为什么会返回空 set

[scalaer]

from functools import reduce

print({1, 2} & {2, 3})
print(reduce(lambda x, y: x & y, [{1, 2}, {3, 4}, {2, 3}]))

output:

{2}
set()

[itskingname]

因为首先是{1, 2} & {3, 4}结果为{}，然后{} & {2, 3}结果依然为{}

[scalaer]

@itskingname 😯， 我蠢了