s = set([1,2,4,5,2,1,4,5]) print (s)
s.add(19) print(s)
s.add(20) print(s)
s.remove(2) print(s)
输出的结果是: {1, 2, 4, 5} {1, 2, 19, 4, 5} {1, 2, 4, 5, 19, 20} {1, 4, 5, 19, 20}
为什么s.add(19)后会无序,但是s.add(20)后又有序啦
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dayancheng
s = set([1,2,4,5,2,1,4,5]) print (s)
s.add(19) print(s)
s.add(20) print(s)
s.remove(2) print(s)
输出的结果是: {1, 2, 4, 5} {1, 2, 19, 4, 5} {1, 2, 4, 5, 19, 20} {1, 4, 5, 19, 20}
为什么s.add(19)后会无序,但是s.add(20)后又有序啦