python3 中 set 进行列表去重时为什么会自动进行排序(升序)

In [35]: set([1, 3, 8, -2, 99, 98, 77, 1, 5, 3, 77, 12])
Out[35]: {-2, 1, 3, 5, 8, 12, 77, 98, 99}

In [31]: o = [2,5,1,2,4,6,0,33,5.4,6.4]

In [32]: c = set(o)

In [33]: c
Out[33]: {0, 1, 2, 4, 5, 5.4, 6, 6.4, 33}

set

out

Python3

排序

3 replies • 2020-01-02 11:13:19 +08:00

yemoluo

Sep 6, 2018

楼主多试一试几次

即使你看到了十次都是有序的，也不要相信，`set` 是无序的 `set` 是无序的 `set` 是无序的

PythonAnswer

Sep 6, 2018

楼主多看文档

5.4. Sets

Python also includes a data type for sets. A set is an unordered collection with no duplicate elements. Basic uses include membership testing and eliminating duplicate entries. Set objects also support mathematical operations like union, intersection, difference, and symmetric difference.

Curly braces or the set() function can be used to create sets. Note: to create an empty set you have to use set(), not {}; the latter creates an empty dictionary, a data structure that we discuss in the next section.

drawstar

Jan 2, 2020

@PythonAnswer 从文档能看出啥？无序的？

python3 中 set 进行列表去重时 为什么会自动进行排序(升序)

python3 中 set 进行列表去重时为什么会自动进行排序(升序)