我在谈到这一问题时,对<条码>、<>条码>、<条码>、<条码>frozenset<>/条码>和<条码>的订购进行了思考。 灰 Python没有保证任何订购,任何订单都与<条码>hash条码>的一定数值挂钩。 但是,对数值的厚度或体积的内面值是否标准化? 换言之,
hash((a,b,c,d,e,f,g))
如果a
,b
,c
,d
,e
,f
,g
是数值或str
?
我在谈到这一问题时,对<条码>、<>条码>、<条码>、<条码>frozenset<>/条码>和<条码>的订购进行了思考。 灰 Python没有保证任何订购,任何订单都与<条码>hash条码>的一定数值挂钩。 但是,对数值的厚度或体积的内面值是否标准化? 换言之,
hash((a,b,c,d,e,f,g))
如果a
,b
,c
,d
,e
,f
,g
是数值或str
?
扼杀和愤怒的散射值绝对没有标准化。 它们可能随着对沙尔的任何新执行而发生变化,包括2.6.1至2.6.2之间,或者在Mac和PC之间对同一版本的执行等。
更为重要的是,稳定的散射值并不意味着重复性循环。 您不能取决于一套数值的顺序,即 /strong>。 即使在一个进程内,两套办法也可以是平等的,不能按同一顺序收回其价值。 如果一套措施增加了许多内容和删除内容,但另一套措施没有:
>>> a = set()
>>> for i in range(1000000): a.add(str(i))
...
>>> for i in range(6, 1000000): a.remove(str(i))
...
>>> b = set()
>>> for i in range(6): b.add(str(i))
...
>>> a == b
True
>>> list(a)
[ 1 , 5 , 2 , 0 , 3 , 4 ]
>>> list(b)
[ 1 , 0 , 3 , 2 , 5 , 4 ]
作为NOT维持秩序的证据,DKGasser认为了这一点。 在CPython,结果如下:
>>> test = [ cat , dog , mouse , rat , 6126, 516]
>>> temp = []
>>> for x in set(test):
temp.append(x)
>>> temp
[516, dog , 6126, cat , rat , mouse ]
在Jython,结果如下:
>>> test = [ cat , dog , mouse , rat , 6126, 516]
>>> temp = []
>>> for x in set(test):
temp.append(x)
>>> temp
[6126, dog , cat , rat , 516, mouse ]
Q.E.D.
它完全取决于口译的履行,而根本不是语言本身所保证的。
http://www.ohchr.org。
道歉,但《任择议定书》似乎希望得到明确的“从可怕的口号”证明,不能保证秩序。 最后,我发现:
http://docs.python.org/library/stdtypes.html#dict
www.un.org/Depts/DGACM/index_spanish.htm CPython implementation details: 关键和价值按非宗教的任意顺序排列,因执行而异,取决于独裁者插入和删除的历史。
因此,你可以这样做。 现在请这样做。
Speaking from the general idea of a hash set, you can t rely on the order. Even if the implementation you are using happens to preserve order, it s a bad idea to rely on that unless the documentation specifically says that you can.
保证所有物体的散射值永远不变,与所设定的执行是否保持秩序无关。
简单地说,要做到这一点,一个常见的简单办法是建立一系列的原产地。 添加一个项目时,其散射值即产生,然后(以简单易懂的方式)绘制到阵列大小的数值范围,然后将物体放在阵列中。 如果在该地点已经有一个项目(即阵列少于可能项目的数量),则使用一些碰撞算法。
在规定执行中的项目数目发生变化时,基本执行可能会改变数据储存的阵列的规模(如:SIZE*1.5)。 发生这种情况时,回收中物品的顺序很可能改变。 通常只有插入,但可以删除,即使执行活动分散于其他行动。
有若干种语文的定点实施,以保证订购,有些则保证,当你两次插入同一项目时,按同样顺序插入这些物品(如,最终会终止,等等)。 然而,除非你重新审视具体内容,否则保证你不能依赖它。
具体事例是,在下一期“灰色”释放时,确定各套的基本代码无效。 有些人决定,他们将改写,使其更快。 即便是旧的履约情况是为了维护秩序......如果文件没有说是的话,那么新的实施是没有这种财产的自由。
AFAIK,_hash__(
> 这一目标永远是独特的。 在乱葬的情况下, has是价值本身。
http://docs.python.org/vis/datamodel.html#object.__hash__" rel=“nofollow noreferer” 文件:
object.hash(self)
Called by built-in function hash() and for operations on members of hashed collections including set, frozenset, and dict. hash() should return an integer. The only required property is that objects which compare equal have the same hash value; it is advised to somehow mix together (e.g. using exclusive or) the hash values for the components of the object that also play a part in comparison of objects.
因此,贵物体的顺序将always<>em>,取决于该物体的散射方法的具体实施,以及该方法是否回收了您完全根据习惯目标确定的“玉米感”。
TL;DR - Yes, the hash will determine the order of your objects. The order will of course depend on the results given by the hashes or those objects.
<代码>hash(>> 字典>功能有预设的一套业务,具有其价值。 http://effbot.org/zone/python-hash.htm 特定物体(无论大小)总会产生同样的散射值。
当你将物品列入一套(或类似的结构)时,只要所设定的规模达到一定门槛值,就将其重新回收。 因此,尽管您可能无法预测某一组项目将按顺序排列,但samen<>>>>。 各个项目总顺序相同。
因此,...... a,b,c,d,e,f,g
,,其中每一条是具体的扼杀或诱发,在一套装置中填满时始终按同一顺序出现。 (though,但不一定是我刚才列出的顺序:/em>。
www.un.org/Depts/DGACM/index_spanish.htm • 根据评论进行澄清。
www.un.org/Depts/DGACM/index_spanish.htm EDIT: Console Proof
Ran under python 2.5 on Debian 32bit, python 3 on 64bit and 2.7 onWindows XP 32bit. There are out the same in all of them, and I ve used the fact in programmes before with no questions.
感谢 Chris for the Additional Platform to establish test.
>>> test = [ cat , dog , mouse , rat , 6126, 516]
>>> temp = []
>>> for x in set(test):
temp.append(x)
>>> temp
[516, dog , 6126, cat , rat , mouse ]
>>> temp = []
>>> for x in set(test):
temp.append(x)
>>> temp
[516, dog , 6126, cat , rat , mouse ]
>>>
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