大约有 2,000 项符合查询结果(耗时:0.0291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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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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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
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Resource interpreted as Document but transferred with MIME type application/zip
...d attribute in your <a> tag.
<a href="http://example.com/archive.zip" download>Export</a>
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/a#attr-download
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程序员之网络安全系列(二):如何安全保存用户密码及哈希算法 - 更多技术 ...
...加密后的数据难以解密呢?我们现在比较流行的做法就是把密码进行Hash存储。
Hash
哈希算法将任意长度的二进制值映射为较短的固定长度的二进制值,这个小的二进制值称为哈希值。哈希值是一段数据唯一且极其紧凑的数值表...