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Hot questions
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scipy - Only size-1 arrays can be converted to Python scalars: Integrate.quad Vs Integrate.quadrature
I'm trying to calculate an integral. When I use the function scipy.integrate.quad the code works perfectly. However, ... : only size-1 arrays can be converted to Python scalars...
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python - django with postfix can't connect to localhost smtp-server
i have configured postfix as a null client on my machine and the configuration also seems to be ... " smtplib.SMTPServerDisconnected: Connection unexpectedly closed: timed out...
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node.js - MERN app works locally, but I get 503 when deploying to Heroku
I'm working on a MERN app, pretty much done, all I have left to do is deploy it. The app works perfectly when I ... .message}`.red) process.exit(1) } } module.exports = connectDB...
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java - Convert LocalDateTime of a particular time zone to eastern time accounting daylight savings
I have a LocalDateTime field representing a date and time, and a separate timezone string which tells its time zone. I ... accordingly with either -05:00 or -04:00 as applicable....
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android - React Native: Get Lifecycle or LifecycleOwner in native module
I'm developing a native module for React Native which wraps the CameraX API. The CameraX API is a lifecycle-aware API, ... from my React lifecycle? I'd appreciate any kind of help....
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three 场景对象可以新增自定义属性吗
如果我给Scene添加一个description属性,但是在后期操作会发现description属性并不存在 使用scene.toJSON() 转换 description属性会丢失 后来尝试把他转化为字符串的JSON.stringfy(scene) 存储起来,然后在JSON.parse(scene) 发现还是没有description属性,如下图...
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求教js正则校验问题
js校验同时包含三项(大、小写字母,数字)...
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flutter自定义路由过渡动画如何给旧页面添加动画?
我想用一个ios页面过渡效果的动画,但不想要阴影,按照网上的一些教程写的自定义动画,发现动画只对新页面有效,请问如何给旧页面加上动画?...
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Added hidden element, but now my hover effect doesn't work anymore
I have a problem with my javascript code, I made a hover effect for a text to play a video. but now I want to ... onmouseover="PlayH()" onmouseout="PauseH()">HVAC</button> </div>...
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数组中的对象是否包含某个键,如果包含则把这个键值对插入其他对象?
list = [ { a: '1', b: '2', c: '3' }, { a: '3', b: '5', c: '8', d: '4' },{ a: '10', b: '20', c: '30' } ]; 就是判断有没有d,如果哪一项没有d,则加上d且d的值等于有d的呢一项。...
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请教一个匹配字符串规则的正则表达式
目标字符:330nF(250V)(xx) 我写的正则:^([^ ()]+)(\(.*?\))$ 有个问题是多个括号如:330nF(250V)(xx)(yy)也能匹配到,,,想要匹配以下对应关系: ... 330nF(250V) 330nF(250V)(xx) -> 330nF(250V) 330nF(250V)(xx)(yy) -> 330nF(250V)...
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c# - ASP.NET MVC application not working after publish in production
I have been working on an asp.net mvc application, its fully functional in my development pc but after deployment in production(iis ... <i class="ace-icon fa fa-lightbulb-o"></i>...
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529
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javascript - Unhandled rejection TypeError: Role.Create is not a function error
I have got stuck on a .create is not a function error when I am trying to repopulate my database when I restart ... ", "Dive Against Debris Speciality"]; module.exports = db;...
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jq怎么获取当前滚动到的元素
有一排列表li,滑动到当前li,里面a元素切出b切入,划走,a切入b切出,然后每个li都有ab元素,下面都同理,有没有思路哈,谢谢...
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chrome通过插件开代理能给客户端软件使用吗,比如vscode?
公司不能安装客户端代理工具,只能通过浏览器代理...
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Webpack运行报错
npm run dev 运行报这个错是配置的哪里错了 Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API ... ) ### 你期待的结果是什么?实际看到的错误信息又是什么?...
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在Postman中调用API,直接返回一张图片,这种API在Angular8中如何调用?
如题,使用Angular如下方法调用,报错如下: getThumbnail(viewId: string):Observable<any> { const headersSite = new HttpHeaders().append('X-Tableau-Auth', ... => console.log(v)) // 无法打印 这种情况,如何处理?...
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tcp - Java Server - Sending packets out incorrectly?
Currently have a TCP server built in Java and I'm sending messages/packets out to clients using their socket ... multiple packets to be received correctly at once without sleeping?...
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Jan 27, 2021
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tcp
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votes
383
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python的微信支付调用例子
微信支付的官网没有提供python的调用接口例子。网上有很多版本的python开源库,不知道用哪个,前辈们能否提供下?...
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Jan 27, 2021
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votes
3.3k
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nvue,mpvue,weex是啥?
最近想接触一下移动端和小程序,网上了解到用uni-app比较简单。 可是百度看了好久这三个概念的解释我是楞看不懂呀。。哪位大佬救救小弟!...
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sorting - C# - Sort items of linked list by date
I am having a Node public class Node { public Node(Pupil pupil) { Data = pupil; Next = null; } ... basically teach it ourselves in university. Help would be really appreciated....
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Jan 25, 2021
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sorting
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字符型数据0x80强转成unsigned int为什么会扩展符号位?
#include <stdio.h> int main(int argc, char *argv[]) { printf("%x ", (unsigned int)(unsigned char)0x80); printf("%x ", (unsigned int)(signed ... 型,为什么符号位也跟着扩展了? P.S. C/C++中输出结果一致...
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字符型数据0x80强转成unsigned
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3.0k
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1
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Linux软件的配置文件寻找路径优先级是什么?
Linux 的三方程序安装之后,配置文件的寻找路径是什么啊? 比如我手动编译安装mysql到/opt/mysql, 它会在哪儿去寻找配置文件? 如果有下面这些mysql的配置文件: /etc/my.conf /etc/mysql/my.conf /opt/mysql/etc/my.conf 它的寻找路径优先级是什么呢?...
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Jan 25, 2021
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3.5k
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生成PDF html2canvas 截图内容 (偶尔) 不全
内容,向左上角偏移了,有时候刷新浏览器又好了,有时候刷新又不行...
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Jan 24, 2021
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生成PDF
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Android YouTube TextView绘制优化方案问题
YouTube在Feed卡片的标题等信息上,并没有布局边界,应该不是使用TextView实现的。 个人猜测是对文本的渲染做了某些黑科技优化,有大佬研究过相关渲染么?怎样可以实现类似的效果?求分享呀...
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Android
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3.4k
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artificial intelligence - Is there a way to monitor the instance pricing from all cloud providers in real time?
I made a machine learning model and wish to train it using the cloud at a low price (Colab is not ... interested in the second-hand instance pricing and spot instance pricing....
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vue中使用箭头函数this指向发生了变化?
getData (data) { let self = this this.$axios.post('http://xxx.net:8092/quotes/retrieve', data).then(res => { console.log(this) // ... 我换成self,发现可以赋值成功,但是template中却没有发生变化是什么原因?...
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bind传参和直接传参的优先级如何?
如下面的代码,test函数内打印入参root,在runTest里return 一个test的bind,bind时给test传参为字符串'root' 然后我调用runTest(),它的调用结果是test函数的引用,但是是 ... () { return test.bind(null, 'root') } runTest()(false) // root...
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