大约有 2,000 项符合查询结果(耗时:0.0291秒) [XML]

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Extract first item of each sublist

... 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...
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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): ... share | improve this answer | follow | ...
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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...
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I need to store postal codes in a database. How big should the column be?

... 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 ...
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SQL Server Installation - What is the Installation Media Folder?

... 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...
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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,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 share | impro...
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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...