python - 为什么将集合应用于列表对其进行排序？
问题描述
我试图了解这个简单脚本上的 Python 行为：
我建立了一个列表，将其洗牌，将其变成一个集合，然后再次变成一个列表。令人惊讶的是，最终列表已排序。
让我们看看代码：
>> array = range(50)
>> array
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49]
>> import shuffle
>> shuffle(array)
>> array
[0, 32, 4, 35, 27, 40, 30, 7, 36, 24, 11, 26, 2, 45, 1, 41, 47, 5, 48, 18, 49, 20, 46, 44, 43, 31, 10, 42, 9, 13, 14, 15, 28, 29, 8, 6, 34, 19, 22, 33, 3, 17, 23, 38, 37, 16, 39, 21, 12, 25]
>> set(array) # The data inside the set already seem to be sorted
set([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49])
>> list(set(array)) # The original array is sorted
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49]
你能解释一下为什么我的最终名单是排序的吗？我认为一个集合是一个无序的集合。我在这里缺少什么副作用？
非常感谢