这段代码为什么会返回空 set

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This topic created in 2615 days ago, the information mentioned may be changed or developed.

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()

2 replies

itskingname

Jul 30, 2019

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

scalaer

Jul 30, 2019

@itskingname 😯，我蠢了