愿望清单项目：itertools.flatten [英] Wishlist item: itertools.flatten
问题描述
对于快速和肮脏的东西，平整一个序列通常很方便
（默认情况下perl会这样做，惊喜）：
[1,2，[3，" hello，[[4]]]] - >
[1,2,3，''你好'' ，4）
其中一个实现是
http://aspn.activestate.com/ASPN/Mai...-tutor/2302348
但这样的东西在itertools中也会很方便。
看起来很简单，但是在尝试生成
时我设法搞砸了好几次我自己的实现（无限递归）。
-
Ville Vainio http://tinyurl.com/2prnb
For quick-and-dirty stuff, it''s often convenient to flatten a sequence
(which perl does, surprise surprise, by default):
[1,2,[3,"hello",[[4]]]] ->
[1, 2, 3, ''hello'', 4]
One such implementation is at
http://aspn.activestate.com/ASPN/Mai...-tutor/2302348
but something like this would be handy in itertools as well.
It seems trivial, but I managed to screw up several times when trying
to produce my own implementation (infinite recursion).
--
Ville Vainio http://tinyurl.com/2prnb
推荐答案
2005年3月11日13:32： 45 + 0200，传言说Ville Vainio
< vi *** @ spammers.c OM>可能写得：
On 11 Mar 2005 13:32:45 +0200, rumours say that Ville Vainio
<vi***@spammers.com> might have written:
对于快速和肮脏的东西，平整一个序列通常很方便
（Perl会这样做，出乎意料的是，默认情况下）：
[1,2，[3，" hello，[[4]]]] - >
[1,2,3，''你好' '，4]
其中一个实现是
http://aspn.activestate.com/ASPN/Mai...-tutor/2302348
但是这样的话会在itertools中也很方便。
这看起来微不足道，但是当我尝试生成我自己的实现（无限递归）时，我设法搞砸了几次。
For quick-and-dirty stuff, it''s often convenient to flatten a sequence
(which perl does, surprise surprise, by default):
[1,2,[3,"hello",[[4]]]] ->
[1, 2, 3, ''hello'', 4]
One such implementation is at
http://aspn.activestate.com/ASPN/Mai...-tutor/2302348
but something like this would be handy in itertools as well.
It seems trivial, but I managed to screw up several times when trying
to produce my own implementation (infinite recursion).
参见Python Library Reference，5.16.3 Recipes。现在所有和任何（也作为食谱在那里呈现的b $ b）被认为是包括在内，也许flatten得到
a机会。
这只是一个个人意见，但我在讨论这些有用的*积木*时讨厌对库（迭代工具
模块）的扩展*。
什么碰巧包含电池？
-
TZOTZIOY，我说英格兰最好。
发送和容忍时要严格在接收时。 （来自RFC1958）
我真的应该在与人交谈时牢记这一点，实际上......
See Python Library Reference, "5.16.3 Recipes". Now that all and any (also
presented as recipes there) are considered to be included, perhaps flatten gets
a chance too.
This is just a personal opinion, but I detest restraints on library (itertools
module in this case) expansion when talking about such useful *building blocks*.
What happened to "batteries included"?
--
TZOTZIOY, I speak England very best.
"Be strict when sending and tolerant when receiving." (from RFC1958)
I really should keep that in mind when talking with people, actually...
>>>> ;> "&的Christos QUOT; == TZOTZIOY< Christos>写道：
>>>>> "Christos" == TZOTZIOY <Christos> writes:
对于快速和肮脏的东西，平整一个序列通常很方便
（Perl会这样做，惊喜惊喜，默认情况下）：
[1,2，[3，" hello，[[4]]]] - >
[1,2， 3，''你好''，4]
For quick-and-dirty stuff, it''s often convenient to flatten a sequence
(which perl does, surprise surprise, by default):
[1,2,[3,"hello",[[4]]]] ->
[1, 2, 3, ''hello'', 4]
Christos>请参阅Python库参考，5.16.3配方。现在
Christos>所有和任何（也是
食谱是：
def flatten（listOfLists）：
返回列表（链（* listOfLists））
那个是微不足道的，因为它只会使一个级别变平。
我正在谈论的扁平化涉及扁平化任意深度
得到单个序列的atoms。itertools实现可能
也可以通过使用堆栈来避免递归。
Christos>这只是一个个人意见，但我讨厌限制
Christos>在库（本例中为itertools模块）扩展
Christos>时谈论这些有用的*积木*。
是的 - 特别是在扁平化的情况下。如果它被认为是有用的
是默认行为在perl（这是公认的braindamaged），
它肯定值得保证作为单个函数包含在
stdlib中。
-
Ville Vainio http://tinyurl.com/2prnb
2005年3月12日00:44:39 +0200，谣言说Ville Vainio
< vi *** @ spammers.com>可能写得：
On 12 Mar 2005 00:44:39 +0200, rumours say that Ville Vainio
<vi***@spammers.com> might have written:
Christos>这只是个人意见，但我讨厌克制。
Christos>在库（本例中为itertools模块）扩展
Christos>在谈论这些有用的*积木时*。
是的 - 尤其是在扁平化的情况下。如果它被认为是有用的，可以成为perl中的默认行为（这无疑是braindamaged），
它肯定有必要作为单个函数包含在
stdlib中。
Christos> This is just a personal opinion, but I detest restraints
Christos> on library (itertools module in this case) expansion
Christos> when talking about such useful *building blocks*.
Yeah - esp. in the case of flattening. If it was deemed useful enough
to be the default behavior in perl (which is admittedly braindamaged),
it should surely warrant being included as a single function in the
stdlib.
或者一个窗口函数，我需要足够的时间在*单独的*场合
将它添加到我的个人stdlib中。模块（暗示它可能是
itertools的一部分）：
window（''hello''，2）=> ''他'，''el''，''l''，''lo''
-
TZOTZIOY，我说英格兰最好。
发送时要严格，接收时要宽容。 （来自RFC1958）
我真的应该在与人交谈时牢记这一点，实际上......
Or a window function, which I have needed enough times in *separate* occasions
to add it in one of my personal "stdlib" modules (hinting it could be part of
itertools):
window(''hello'', 2) => ''he'', ''el'', ''ll'', ''lo''
--
TZOTZIOY, I speak England very best.
"Be strict when sending and tolerant when receiving." (from RFC1958)
I really should keep that in mind when talking with people, actually...
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