一致性：扩展数组与乘法？ [英] consistency: extending arrays vs. multiplication ?
问题描述
大家好，
刚刚开始使用python，我觉得简单的数组操作'''''
和''+''不进行乘法/加法，而是扩展/加入
数组：
a = [1,2,3]
b = [4,5,6]
a + b
[1,2,3,4,5,6]
而不是我的预期：
[5,7,9]
或
2 * a
[1,2,3,1,2,3]
嗯，它与字符串一致但是容忍字符串操作是
特殊对我来说是好的，因为a +b - > ''ab'':)
为什么不让它成为另一个函数，比如a.stretch（）或a.expand（）和
a.extend（）在做什么无论如何都是相同的，并且更具可读性...
将它放在更大的视图中：
Ufuncs是非常合理的罪（a）等...所有这些都不会奏效，因为
的'+''，'''''语法。好的我可以使用numarray，但是看到它的
PEP并且可能包含在python中某些时候
的不一致让我非常头疼...
将来会改变吗？或者这个100 * [0]语法是否适用于所有年龄段的
石头？
最佳，
Soeren。
PS：因为我对python很新，请原谅/纠正我！
在< ma *************************************** @ python。 org>，Soeren
Sonnenburg写道：
刚刚开始使用python，我觉得简单的数组操作'''''
和' '+''不做乘法/加法，而是扩展/加入
数组：
a = [1,2,3]< blockquote class =post_quotes> b = [4,5,6]
a + b
[1,2,3,4,5,6]
两者都在列表本身上运行，而不是在内容上运行。很好
如果你问我一致。
Ciao，
Marc''BlackJack''Rintsch
2005年7月23日星期六18:30:02 +0200，Soeren Sonnenburg写道：
大家好，
刚刚开始使用python，我觉得简单的数组操作'''''
和'''''不做乘法/加法，而是扩展/加入一个
数组：
*和+不是数组操作，它们是列表操作。
Python中的列表可以包含任何内容，而不仅仅是数值。
Python没有内置的数学数组，也称为
矩阵。有些模块可以做到这一点，但我还没有使用它们。 Google
on Numeric Python。
-
史蒂文。
<
Soeren Sonnenburg写道：大家好，
刚开始使用python，我觉得简单的数组操作'''''
并且''+''不做乘法/加法，而是扩展/加入
数组：
a = [1,2,3]b = [4,5,6]
a + b
[1,2,3,4,5,6]
而不是我的预期：
[5,7,9]
为了得到你的预期，请使用
[x + y代表（x，y）的拉链（a，b）]
Hi all,
Just having started with python, I feel that simple array operations ''*''
and ''+'' don''t do multiplication/addition but instead extend/join an
array:
a=[1,2,3]
b=[4,5,6]
a+b [1, 2, 3, 4, 5, 6]
instead of what I would have expected:
[5,7,9]
or
2*a
[1, 2, 3, 1, 2, 3]
Well it is consistent to strings but tolerating string-operations to be
special is ok to me as "a" + "b" -> ''ab'' :)
Why not make it another function like a.stretch() or a.expand() and
a.extend() is there doing the same anyway and is more readable...
Putting this in a larger view:
Ufuncs are very reasonable sin(a), etc ... all that won''t work because
of that ''+'',''*'' syntax. Ok I can use numarray for that, but seeing its
PEP and a possible inclusion into python at some point that
inconsistency is giving me quite some headache...
Will that change in the future ? Or is this 100*[0] syntax put into
stone for all ages ?
Best,
Soeren.
PS: As I am very new to python please forgive/correct me!
In <ma***************************************@python. org>, Soeren
Sonnenburg wrote:
Just having started with python, I feel that simple array operations ''*''
and ''+'' don''t do multiplication/addition but instead extend/join an
array:
a=[1,2,3]b=[4,5,6]
a+b
[1, 2, 3, 4, 5, 6]
Both operate on the lists themselves and not on their contents. Quite
consistent if you ask me.
Ciao,
Marc ''BlackJack'' Rintsch
On Sat, 23 Jul 2005 18:30:02 +0200, Soeren Sonnenburg wrote:
Hi all,
Just having started with python, I feel that simple array operations ''*''
and ''+'' don''t do multiplication/addition but instead extend/join an
array:
* and + are not array operations, they are list operations.
Lists in Python can contain anything, not just numeric values.
Python doesn''t have built-in mathematical arrays, otherwise known as
matrices. There are modules that do that, but I haven''t used them. Google
on Numeric Python.
--
Steven.
Soeren Sonnenburg wrote:Hi all,
Just having started with python, I feel that simple array operations ''*''
and ''+'' don''t do multiplication/addition but instead extend/join an
array:
a=[1,2,3]b=[4,5,6]
a+b
[1, 2, 3, 4, 5, 6]
instead of what I would have expected:
[5,7,9]
To get what you expected, use
[x + y for (x, y) in zip(a, b)]
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