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python - How to get a zero column when filtering for something with no results?

I'm trying to filter for something, but if there are no results I want to get a 'zero' column rather than a blank df. ... create that, but I'm not sure how. Any thoughts? Thanks!...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Using part of a variable as bool

Let's say memory is precious, and I have a class with a uint32_t member variable ui and I know that the values ... to be disagreement about using inline ASM or some sort of shift....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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containers - delete Kubernetes persistent volume from statefulset after scale down

I scaled my statefulset up to 4, and when scaling down to 1, I saw that I still have 4 persistent volumes ... -8c5f-dff2843b693f 7Gi RWO Delete Bound default/data-3 default 4h3m...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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传统IT架构下面临的挑战？

1.IT系统日趋庞杂且难以维护在制造企业，随着业务规模的不断扩张，用于支撑业务运行的IT系统和基础设施也日趋庞杂，从PLM PDM等研发管理系统到ERP CRM OA等业务管理系统，再到MES APS和DCS等工业层的生产 ... 小程序进来看看），专业助上云服务，建议搜搜小程序看看我们，或者直接VX：Liyunshuai20联系，当交个朋友交流一下经验 ...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Replacing XML data using Python script

I wanted to know if it is possible to write code that replaces text in an XML file based on user input. Below is an ... ID" If anyone knows how to do this I would be grateful....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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如何更改当前展示的图片的宽度？

就是想让当前的展示的图片更宽一些中间的空隙更小一些这是网上找的代码调了半天都没法调宽度直接调宽度左右多出来的边会不一样宽请问这个应该改哪里？ Page({ /** * ... 7s ease-out 0s; } .zoom-in { transform: scale(1); transition: all 0.7s ease-in 0s; }...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bluetooth lowenergy - BlueNRG wrong header

I bought STEVAL-MKSBOX1V1 of ST and wanted to write my own library to create a BLE application. The BLE module on ... would like to have a bit of consulting. Thanks in advance...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# adding list<string> to each cell in column google sheets api

I have a list of string with data. My mission is simple: need to write data from list to rows starts with A2 ... TimeSpan.FromSeconds(1) > DateTime.Now); appendRequest.Execute(); }...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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问一个网络传输和序列化问题！

最近用axios发现了序列化这三个字，很好奇，上网搜了下出现什么编码，字节，二进制数据流，直接懵了。什么是序列化，为什么需要序列化？ content-type和序列化有啥关系吗？当content-type为form-url-encoded的时候，我看数据格式是用&符号连接的，这种格式的数据和json一样也是字符串吗？基础不太好，求大佬指教了！...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mysql 连接长期不释放及连接池相关问题

最近接手一个老系统，其中有部分逻辑是通过脚本去完成的核心逻辑大概是这样： <?php $db = new Mysqli($db_host, $db_user, $db_password); function doSomething($db){ // 查询符合条件的数 ... 如果长期占用一个连接不释放，会导致什么问题吗？上面的场景是否需要使用连接池？...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How do you configure spring boot 2 to return xml by default?

To start with I've read this: Spring boot - setting default Content-type header if it's not present in request The ... both JSON and XML at same specificity we need to return XML....

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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JavaScript怎么做音频、视频推流？

怎么用JavaScript做音频、视频推流？获取到每一帧，在每一帧之前空出八个字节设置参数？...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Building Android Command Line Executable with Prebuilt Shared Library

I'm trying to cross-compile an Android executable (command line) that calls a method inside a proprietary android prebuilt ... binary.mk:738: obj/local/arm64-v8a/getscore] Error 1...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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laravel-admin弹出表单select组件无法使用ajax搜索

Laravel Version: 6.2 PHP Version: 7.2 Laravel-admin: 1.7 $this->select('shop_id', __('wbq.shop_name'))->options(function ($id) ... >ajax('/api/shops') 在Form表单中是正常的,$form->select......

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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openmdao - Passing Initial Guesses to Non-Linear Solver as a Function of Outputs of Other Components

I am working on a relatively simple model with 3 Explicit Components (Leg, Cable, BCan) and 1 Implicit (LegCableBal). The ... ['L_C0']``` Thank you for your time Justin, R...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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在php-fpm环境中，为什么不建议使用mysql长连接，而却允许redis长连接

是因为redis使用的是IO复用模型，单线程可以同时处理多个连接，而mysql开源版一个线程对应一个连接吗？...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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使用ant 实现以下布局请问代码该如何实现

主要使用ant的table组件然后点击向下加一行就可以再加一行数量米操作：删除在最后一项下面请问代码应该如何实现...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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谷歌浏览器新开窗口打印，关闭新窗口，旧窗口输入框无法输入

谷歌浏览器； vue项目；问题：打印预览下，input无法输入操作步骤： 1.进入项目，在A窗口，window.open打开一个新的窗口 2.新的窗口是打印预览状态下 3.直接点窗口的X关闭打印窗口或者鼠标滚轮关闭 4.旧的窗口输入框就无法输入内容注：这样关闭window.onbeforeunload方法无法监听；...