循环列表。 [英] Loop in list.

问题描述

这种类型的结构来自哪里：


mat = ['a''为我的范围（3）]？


这将生成一个包含三个元素的列表但是

我在任何一本书中都没有看到它的参考。

解决方案

Jim写道：

这种类型的结构来自哪里：

mat = [''a''对于我在范围（3）]？

这将产生一个包含三个元素的列表，但是我在任何一本书中都没有看到它的参考。

它被称为列表理解。因为我不知道你的意思是什么书，所以我不能说它是否覆盖在那里。


-

Diez B. Roggisch

Jim写道：

这种类型的结构来自哪里：

mat = [''''为我的范围（3）]？

这会产生一个三个元素的列表但是
我在任何一本书中都没有看到它的参考。

它被称为列表理解它出现在Python 2.0中。

http ：//www.amk.ca/python/2.0/index.h...00000000000000


Jeremy Jones

"吉姆" < JT *** @ att.net>写道：

这种类型的结构来自哪里：

mat = [''''为我的范围（3）]？br这将生成一个包含三个元素的列表，但是我没有在任何一本书中看到它的参考。

它被称为列表理解，并在Python 2.0中添加。

http://www.amk.ca/python/2.0/index.h...00000000000000
http://docs.python.org/tut/node7.htm...00000000000000
http://docs.python.org/ref/lists.html


Python 2.4引入了一种称为生成器表达式的变体：

http://www.python.org/doc/2.4/whatsnew/node4.html
http://www.python.org/peps/pep-0289.html
http://docs.python.org/ref/ genexpr.html


< / F>

Where did this type of structure come from:

mat = [''a'' for i in range(3)] ?

This will produce a list of three elements but
I don''t see reference for it in any of the books.

解决方案

Jim wrote:

Where did this type of structure come from:

mat = [''a'' for i in range(3)] ?

This will produce a list of three elements but
I don''t see reference for it in any of the books.

Its called a list-comprehension. And as I don''t know what books you mean, I
can''t say if its covered there or not.

--
Regards,

Diez B. Roggisch

Jim wrote:

Where did this type of structure come from:

mat = [''a'' for i in range(3)] ?

This will produce a list of three elements but
I don''t see reference for it in any of the books.

It''s called a list comprehension and it appeared in Python 2.0.

http://www.amk.ca/python/2.0/index.h...00000000000000

Jeremy Jones

"Jim" <jt***@att.net> wrote:

Where did this type of structure come from:

mat = [''a'' for i in range(3)] ?

This will produce a list of three elements but
I don''t see reference for it in any of the books.

it''s called "list comprehension", and was added in Python 2.0.

http://www.amk.ca/python/2.0/index.h...00000000000000
http://docs.python.org/tut/node7.htm...00000000000000
http://docs.python.org/ref/lists.html

Python 2.4 introduces a variation called "generator expressions":

http://www.python.org/doc/2.4/whatsnew/node4.html
http://www.python.org/peps/pep-0289.html
http://docs.python.org/ref/genexpr.html

</F>

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