宇宙集 [英] A Universe Set

问题描述

是否曾建议添加Universe Set对象。比如U

= set（0），那么任何对象都是U的成员？也许这会变成

一些疯狂的Cantorian东西，因为U在U.但似乎它会有用并且与emptyset具有良好的对称性：set（[ ]），

是：


对于任何对象a：

" a in set（[]）"返回False

" a in set（0）"返回True

Has the addition of a Universe Set object ever been suggested. Like U
= set(0), so that any object was a member of U? Maybe this gets into
some crazy Cantorian stuff since U is in U. But it seems like it would
be useful and would have a nice symmetry with emptyset:set([]), that
is:

for any object a:
"a in set([])" returns False
"a in set(0)" returns True

推荐答案

jo*********@gmail.com 写道：

是否曾建议添加Universe Set对象。比如U

= set（0），那么任何对象都是U的成员？

Has the addition of a Universe Set object ever been suggested. Like U
= set(0), so that any object was a member of U?

在[61]中：类UniverseSet（对象）：

....：def __contains __（self，x）：

....：返回True

....：


在[62]中：U = UniverseSet（）


在[63]中：1在U

Out [63]：正确


在[64]中：2在U

Out [64]：正确


在[65]中：'''''''''''''''
out [ 65]：真实


在[66]中：U在U

Out [66]：正确

-

Robert Kern


我开始相信整个世界都是一个谜，一个无害的谜团

这太可怕了通过我们自己的疯狂尝试来解释它，好像它有一个潜在的真相。

- Umberto Eco

In [61]: class UniverseSet(object):
....: def __contains__(self, x):
....: return True
....:

In [62]: U = UniverseSet()

In [63]: 1 in U
Out[63]: True

In [64]: 2 in U
Out[64]: True

In [65]: ''something'' in U
Out[65]: True

In [66]: U in U
Out[66]: True
--
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco

jo*********@gmail.com 写道：

jo*********@gmail.com wrote:

是否曾建议添加Universe Set对象。比如U

= set（0），那么任何对象都是U的成员？也许这会变成

一些疯狂的Cantorian东西，因为U在U.但似乎它会有用并且与emptyset具有良好的对称性：set（[ ]），

是：


对于任何对象a：

" a in set（[]）"返回False

" a in set（0）"返回True

Has the addition of a Universe Set object ever been suggested. Like U
= set(0), so that any object was a member of U? Maybe this gets into
some crazy Cantorian stuff since U is in U. But it seems like it would
be useful and would have a nice symmetry with emptyset:set([]), that
is:

for any object a:
"a in set([])" returns False
"a in set(0)" returns True

>> class universe（object）：

>>class universe(object):

... def __contains __（self，thing）：

...返回True

...

... def __contains__(self, thing):
... return True
...

>> U = universe（）
1 $ U

>>U = universe()
1 in U

True

True

>> U
中没有

>>None in U

True

True

>> U in

>>U in U

True

True

>>>

>>>

当然最后一个示例显示您的实施可能需要改变
，具体取决于您查看的方式拉塞尔的悖论......


问候

史蒂夫

-

史蒂夫霍顿+44 150 684 7255 [phone]

Holden Web LLC / Ltd http ：//www.holdenweb.com

Skype：holdenweb http ：//holdenweb.blogspot.com

最近的Ramblings http://del.icio.us/steve.holden

Of course the last eexample shows that your implementation may need to
change depending on how you view Russell''s paradox ...

regards
Steve
--
Steve Holden [phone] [phone]
Holden Web LLC/Ltd http://www.holdenweb.com
Skype: holdenweb http://holdenweb.blogspot.com
Recent Ramblings http://del.icio.us/steve.holden

2006年10月3日星期二23:13:08 - 0500，Robert Kern< ro ********* @ gmail.comwrote：

On Tue, 03 Oct 2006 23:13:08 -0500, Robert Kern <ro*********@gmail.comwrote:

jo ********* @ gmail.com 写道：

>是否曾建议添加Universe Set对象。像U
= set（0），那么任何对象都是U的成员？

>Has the addition of a Universe Set object ever been suggested. Like U
= set(0), so that any object was a member of U?

在[61]中：类UniverseSet（对象）：

....：def __contains __（self，x）：

....：返回True

....：

In [61]: class UniverseSet(object):
....: def __contains__(self, x):
....: return True
....:

是的。但请注意，能够自己编写它是一回事，在标准库中拥有它并且知道任何人都是另一个。


我一直渴望对于一些类似的事情一段时间，我仍然没有

确定他们是好主意，还是因为在Uni学习功能而导致的脑损伤。例如：


- 通配符对象，与其他所有内容进行比较

- 无限xrange（）s

- 黑洞函数''def f（* args）：传递''

- 身份函数''def f（x）：return x''


/ Jorgen


-

// Jorgen Grahn< grahn @ Ph''nglui mglw''nafh Cthulhu

\ X / snipabacken.dyndns.org R''lyeh wgah''nagl fhtagn！

Yes. But note that being able to write it yourself is one thing, having it
in the Standard Library and known to anyone is another.

I have been craving for some similar things for a while, and I''m still not
sure if they are good ideas, or brain damage caused by studying functional
programming at Uni. For example:

- the wildcard object, which compares equal to everything else
- infinite xrange()s
- the black hole function ''def f(*args): pass''
- the identity function ''def f(x): return x''

/Jorgen

--
// Jorgen Grahn <grahn@ Ph''nglui mglw''nafh Cthulhu
\X/ snipabacken.dyndns.org R''lyeh wgah''nagl fhtagn!

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