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python - Why is numpy select is slower than a custom function via apply method?

Say, I have the following dataframe: df = pd.DataFrame({'a':['a','b','c (not a)', 'this is (random)']* ... was the fastest option available)? Or is there a problem with my code?...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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addFirst and removeFirst methods in java not working correctly (linked LIst)

I have a problem in my java code the problem is when I try to use methods multiple times here's an example /* works ... methods I have always to do PureListString t = L.method()....

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opencv - How can I find python library path?

I am trying to find my openCV library path. I am pretty sure it is existing. When I run command ... what is happening between this virtual environtments and base interprater....

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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language agnostic - Is floating point math broken?

Consider the following code: 0.1 + 0.2 == 0.3 -> false 0.1 + 0.2 -> 0.30000000000000004 Why do these inaccuracies happen?...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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193 views

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python modified printing function

I made 5 lists which represents tokens (lexical classes) - identifiers, constants, operators, keywords and separators. ... (all identifiers are printed first, then operators...)...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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PHP_YAF框架,连接路由后, 刷新页面请求数据需要一个世纪?

PHP_YAF框架+Nginx, 本地环境当连接到路由器后, 请求数据非常缓慢,刷新一下页面,甚至需要几分钟,才能处理完. 而不连接路由器, 则完全没有这个问题. 现在换成了, 普联的Tp-link 450M路由, 算是不错的了, 依然还是这样. 求大神回答! 也是搞了很久, 没有解决!!...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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630 views

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xib上设置的颜色和手写代码设置颜色当色值一样的时候但是显示效果不一样

如xib上给一个view设置RGB值为105，148，235 手写代码设置同样的RGB但是显示效果完全不一样...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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417 views

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react-router如何在onEnter钩子上使路由不跳转

在进入路由前进行判断，判断不成功就不进入路由，请问一下要怎么进行设置。我不想转发路由，只想true的时候停留在当前路由,false的时候才跳转到下一个路由...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - How do we perform swap operation in conflict-serializability?

Assume I have the following concurrent transactions: ---------------------- |Ti | Tj | -------------- ... P.S. I looked at other answer but it is not explaining the swap operation....

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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287 views

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android - how i can use table from old my application in new version of my app

I wrote an app that uses a database with a table with 22 columns of data and I entered 300 records into it. for better ... any solution that I do not have to enter data in first?...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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350 views

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Laravel orm多对多关系如何获得中间表的附加字段的内容？

table: users id questions id user_questions user_id question_id desc // 附加字段 unique(user_id, question_id)...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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spring redis redisTemplate注入失败

jar版本：<redis.clients>2.8.1</redis.clients> <spring-data-redis>1.7.5.RELEASE</spring-data-redis> ... .execute(AbstractJettyMojo.java:365) at org.mortbay.jetty.plugin.JettyRu...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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383 views

1 answer

关于博客文章、分类、标签的mysql查询问题

最近在做一个mysql+nodeJS的博客，只是用来练手，由于PHP不会，所以用node作为后台语音开发遇到的查询问题是文章和分类是一对一的文章和标签是一对多的请问这个mysql怎么写，在下是前端，会点简单的mysql，所以就当学习这个吧 ... 磨琢磨表结构如下图图片来源于图片来源，我就没有去做，只是合并了下跪求各位的文章详情查询的sql语句...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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283 views

1 answer

javascript - VS Code not suggesting JSX attributes

While developing a ReactJs project, VS Code used to suggest attributes for JSX elements. For instance, <input type=" ... : "javascriptreact" } in the settings.json based on this...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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280 views

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vs2015编写Form时怎么导入ico图片呢！！！

我下载好的ico图片想修改下左上角窗口的图标导入时报错...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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328 views

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git blame结果中的"+0800"是什么意思？

如题，下面是截图：...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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397 views

1 answer

module - Ansible extract shell output using awk

--- - name: Data Collection hosts: all tasks: - name: List all users shell: "cat /etc/passwd | awk -F: '{print $1}'" ... .202, nobody 172.17.254.202, test1 172.17.254.202, test2 .....

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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642 views

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scala2.12.1在window10中配置环境变量报错不知道什么原因？？

!...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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299 views

1 answer

How to use hooks in filevault-package-maven-plugin

I'm trying to deploy ACL groups to AEM 6.5 instance. Currently recommended way is to use filevault-package ... .AcToolInstallHook</installhook.actool.class> </properties> </plugin>...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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173 views

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vue.js - Passing data across components in Vue

I'm loading two components on a page on my Django project, one is used to query some data from my backend and another ... Vuex, since it might be a bit overkill for this task....

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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html2canvas 插件怎么截图视频文件？

1.使用html2canvas 页面截图图片文字，都截图成功了，但是视频区域那一块是空白的，要怎么弄？...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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vs code这个编辑器，如果高亮显示对应的标签？

我一点div, vs code这个编辑器把所有的div都高亮了，但是只想高亮闭合的那个div,该怎么设置呢?谢谢...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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186 views

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Switch to or open a process in the background - python

Hillo When the user clicks on the program icon, there is a code that checks whether the program is running in the ... (MainThred.exec_()) if __name__ == "__main__": process()...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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617 views

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关于display:inline-block 元素，设置margin: 0 auto; 没有居中效果问题

遇到一个inline-block元素，想让其居中显（span元素水平居中在div中）示，设置margin: 0 auto;也设置了宽度，但没有效果，如果把元素改为block，确可以居中显示，不知是什么原因？ html结 ... ; margin: 0 auto;//display: inline-block;时不起作用，但是block时起作用 ??? } }...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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426 views

1 answer

微信开放平台账号

该管理员身份已绑定过微信开放平台帐号，请使用其他身份进行绑定。第一次注册，却显示该该管理员已经绑定过微信开放平台账号，联系不到客服，不知道怎么解决。但不记得账号，怎么办？...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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421 views

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javascript - CssSyntaxError @fullcalendar/common/main.css Unknown word

I'm using Ember 3.19 and ember-auto-import@^1.5.3 with webpack config to build @fullcalendar/core@^5.5.0 as a module into ... /@fullcalendar') ], use: ['css-loader'] } ] } }...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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191 views

1 answer

CSS .-11u 。。。 .-7u .-6u .-5u 。。。什么意思

我从网上下载了一个模板，在进行修改时发现了如下代码（在main.css文件中），最后几行的.-11u 等等我不明白是什么意思，求教大神讲解，多谢了！！ /* Grid */ .row { border- ... 25%; } .-2u { margin-left: 16.66667%; } .-1u { margin-left: 8.33333%; }...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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315 views

1 answer

关于this的指向

var a = 20; var obj = { a: 10, c: this.a + 20, fn: function () { return this.a; } } console.log(obj.c); //40 console.log(obj.fn());//10 第二个可以理解，第一个为什么是全局呢？...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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