大约有 2,000 项符合查询结果（耗时：0.0281秒） [XML]
Extract first item of each sublist
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You could use zip:
>>> lst=[[1,2,3],[11,12,13],[21,22,23]]
>>> zip(*lst)[0]
(1, 11, 21)
Or, Python 3 where zip does not produce a list:
>>> list(zip(*lst))[0]
(1, 11, 21)
Or,
>>> next(zip(*lst))
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推荐系统算法初探 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...平台上得到满足。
2. 推荐算法
算法是什么？我们可以把它简化为一个函数。函数接受若干个参数，输出一个返回值。
算法如上图，输入参数是用户和item的各种属性和特征，包括年龄、性别、地域、商品的类别、发布时间等...
Iterate through pairs of items in a Python list [duplicate]
...,s2), (s2, s3), ..."
a, b = tee(iterable)
next(b, None)
return zip(a, b)
for v, w in pairwise(a):
...
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App Inventor 2 CustomWebView 拓展：高级版Web浏览器，完美浏览现代Web前...
...面，无法浏览带端口url的页面，这款拓展统统解决。
.aix 拓展下载：
cn.fun123.CustomWebView.aix
基础使用方法：
例如，使用此拓展访问 react 写的网页，效果如下：
而使用原生的Web浏览器则无法访问：
属性
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那些我印象深刻的建议和教诲 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...白了“技术是安身立命之本”的含义，并受用至今。
要把目标设高一点
这还是大学老师的教诲。大四的时候在机房上机，我的程序很快写完了，就和授课的姜老师聊天。他问我找工作的事情，我当时看刘韧《知识英雄2.0》看...
I need to store postal codes in a database. How big should the column be?
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Good link. Even allowing for the punctuation in US ZIP+4, 10 characters would be enough for any country as far as I could tell.
– Jonathan Leffler
Nov 28 '08 at 5:36
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What does the restrict keyword mean in C++?
...paper, it's interesting and worth the time.
Edit
I also found that IBM's AIX C/C++ compiler supports the __restrict__ keyword.
g++ also seems to support this as the following program compiles cleanly on g++:
#include <stdio.h>
int foo(int * __restrict__ a, int * __restrict__ b) {
retu...
Postgresql aggregate array
...meone:
SELECT directory, ARRAY_AGG(file_name)
FROM table
WHERE type = 'ZIP'
GROUP BY directory;
And the result was something like:
parent_directory | array_agg | ------------------------+----------------------------------------+
/home/postgresql/files ...
SQL Server Installation - What is the Installation Media Folder?
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If you've downloaded SQL from the Microsoft site, rename the file to a zip file and then you can extract the files inside to a folder, then choose that one when you "Browse for SQL server Installation Media"
SQLEXPRADV_x64_ENU.exe > SQLEXPRADV_x64_ENU.zip
7zip will open it (standard Windows...
tcp加速技术解决方案 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...可以为每个队列申请一个中断号，然后设置中断亲和性，把该队列的中断映射到某个特定的cpu核心上， 分担了cpu的单核压力。
目前绝大多数网卡都支持该特性，并且该特性是本文其他优化方案的基础条件。
多队列网卡RSS特性
...