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Amazon S3 boto - how to create a folder?

... folders or directories in S3. You can create file names like "abc/xys/uvw/123.jpg", which many S3 access tools like S3Fox show like a directory structure, but it's actually just a single file in a bucket. share | ...
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How do you write a migration to rename an ActiveRecord model and its table in Rails?

I'm terrible at naming and realize that there are a better set of names for my models in my Rails app. Is there any way to use a migration to rename a model and its corresponding table? ...
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Meaning of epsilon argument of assertEquals for double values

...nal double DELTA = 1e-15; @Test public void testDelta(){ assertEquals(123.456, 123.456, DELTA); } If you're using hamcrest assertions, you can just use the standard equalTo() with two doubles (it doesn't use a delta). However if you want a delta, you can just use closeTo() (see javadoc), e.g....
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SQLAlchemy IN clause

... How about session.query(MyUserClass).filter(MyUserClass.id.in_((123,456))).all() edit: Without the ORM, it would be session.execute( select( [MyUserTable.c.id, MyUserTable.c.name], MyUserTable.c.id.in_((123, 456)) ) ).fetchall() select() takes two parameters...
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Truncate number to two decimal places without rounding

...2.55 2.99999 => 2.99 4.27 => 4.27 15.7784514 => 15.77 123.5999 => 123.59 0.000000199 => 1.99 * * As mentioned in the note, that's due to javascript implicit conversion into exponential for "1.99e-7" And for some other values of n: 15.001097 => 15.0010 (n=4) 0.00...
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redmine开源项目管理工具介绍 - 开源 & Github - 清泛网 - 专注IT技能提升

...化显示,同时它支持多项目管理。Redmine是一个自由开放源码软件的解决方案,它提供集成的项目管理功能,问题跟踪,并为多个版本控制的选项的支持。 二、模块介绍 1.概述 该页面提供一个关于该项目的总体概述。其中问题...
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Swift 和 .Net 开源,回顾 2015 年 9 大开源事件 - 开源 & Github - 清泛网 - 专注IT技能提升

...得开发者的注意力。这两个项目是在麻省理工学院的开放源码许可证下发布的,该公司还为其 Azure 云上的一个网络交换机开发了一个基于 Linux 的操作系统。 3、富士通开源自己产品 富士通使用 Linux 已经几十年了,同时也致...
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国际 C 语言混乱代码大赛结果 - 创意 - 清泛网 - 专注C/C++及内核技术

...ang 应是第 7 回。 虽然主办方目前还没有公布这次比赛的源码,但可以围观他俩之前的作品。 Best self documenting program (2011/hou/hou.c) Best use of 1 Infinite Loop (2013/hou/hou.c) Don Yang,Google 工程师 2004/omoikane.c omoikane —&ra...
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CDHtmlDialog的基本使用(JS调用C++函数的实现) - C/C++ - 清泛网 - 专注IT技能提升

...eturn TRUE; } 这样,直接允许访问内部函数,绕过确认。 源码点此下载。 反过来,C++调用Js代码,请看下篇《CDHtmlDialog的基本使用(C++调用JS函数的实现)》。
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ATL COM开发入门(二)(ActiveX/COM组件回调JS) - C/C++ - 清泛网 - 专注C/C++及内核技术

...的例子,参见《ATL创建的ActiveX(COM组件)实现JS回调》。 源码点此下载,如有问题请点此。 ATL COM ActiveX 入门 JS回调