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python - TypeError: Iterable command_prefix or list returned from get_prefix must contain only strings, not Cursor | Discord.py

I was implementing custom prefix usage with my sqlite3 db. I recieve this error whenever I try using the prefix: ... when_mentioned_or(f"{current_prefix}")(bot, message) Thanks!!!...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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图片模块的缓存问题

require 导入的图片，通过new Image().src 的方式实现预加载，但是这种方式好像不能加入到缓存，突然改变图片的src还会是闪一下，要创建一个真实img tag，动态添加到body中才能去请求并缓存起来。请问有什么更简单性能更好更省流量的方法呢？需要预加载的图片创建节点的方式可以缓存 img 对象的方式好像不能缓存...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How to open a new tab in Angular Dart without bootstrapping the app again

I tried to open a new tab using window.open(theUrl, '_blank'); It works but it bootstraps the whole app again. Is there a way to open a new tab without bootstrapping the app ?...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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高德地图点击地图添加marker，第一次点击的时候会出现marker图标，第二次不会

高德地图点击地图添加marker，第一次点击的时候会出现marker图标，第二次不会，这是什么情况，一下是代码 mapObj = new AMap.Map(' ... infoWindow.on('close', clearMarker) infoWindow.open(mapObj, marker.getPosition()); }...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - How to update side menu item list in an ionic react app after login

I'm creating a mobile app with ionic react and used the "ionic start --sidemenu" option. This is my App.tsx <IonApp> ... have to change my code to make it work? Thanks in advance!...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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vue 路由参数变化监听不到变化

搜索的路由在searchkey变化的时候再次点击，并没有变化...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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如何实现一个向量版本的函数，输入行情的时间以及此商品的session，然后返回这一笔行情的session type

在DolphinDB database中，如何实现一个向量版本的函数，输入行情的时间以及此商品的session，然后返回这一笔行情的session type？我想通过这个函数，可以用行情时间取得session type，然后进行group by 或 ... 如输入时间在08:45 ~ 13：45之间，返回1, 在15:00~ 05:00之间，返回2 ...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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DolphinDB GUI中查看变量报Invalid value for HourOfDay错误

同一个表在dolphindb.exe下输命令能查到，但是在GUI里就查不到，一样的查询命令，如下面2个图：，而且在GUI中browse变量会报Invalid value for HourOfDay错误，是什么原因？我的gui版本是1.10.0，跟表中有个字段是中文有没有关系？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pako - Webpack including full dependent .esm.mjs not treeshaking

in my webapp I use the inflate from pako import { inflate } from 'pako' the resulting webpack bundle seems to ... I enable Webpack to only include the needed parts? Thanks Philipp...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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vue路由根据#后面的url显示对应的菜单

比如http://localhost:8080/#/1 那么菜单（路由）显示的是1下面的菜单如果http://localhost:8080/#/2 那么菜单（路由）显示的是2下面的菜单我直接修改路由不生效...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Nginx 重定向到一级域名，还会出现https不安全提示吗？

这个怎么破？我的证书不是通配符证书。但是?Nginx?重定向二级域名到一级域名了。怎么还首先出现这个不安全提示？怎么破解？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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filepath - How to get full path of file using File.WriteAllText in C#?

I have added key in settings file as <add key="Test.Directory" value="Data/Test/XML_Files" />.I need to pass this path ... + Guid.NewGuid().ToString().Substring(1, 5) ), Records);...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - How should I implement overloaded operators so they work properly when new subclasses are added?

If I have a class B, I can add support for subtracting two instances of B and, for debugging purposes ... when new subclasses are added, without modifying existing classes?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Kivy, ScreenManager sizing issue

I am trying to create a game for Android using Kivy. The idea is, for now, to have the main menu, then buttons to navigate. ... png' pos: root.width*0.1 - 50, root.height * 0.0625...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How to multiply all the values in an array in PHP

I am having trouble multiplying the values in my array. When I echo the $buy_option_num; it generates all the array I ... => $buy_option_num) { echo $buy_option_num; } ?> Thanks....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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647 views

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web services - Cannot add certificate to the C# SOAP request

I am trying to connect to the WebService with C# but I cannot attach certificate to the request. I succesfully authorized ... nothing of them solve my problem. Can you help me?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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581 views

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pymongo - How to paginate on array of array with using $skip and $limit in mongodb?

The pagination works on "records" with the following query for the defined document in MongoDB by changing $skip and $limit ... "first_name33", "last_name": "last_name33" }] }] }...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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有外键指向自身的表如何插入第一条数据

有外键指向自身的表如何插入第一条数据...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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elasticsearch中如何递增计数器

es的每次更新都需要重新索引，递增计数器是在原值的基础上加1，如果上一次的递增操作还未完成索引，那么此时的递增岂不是错误的？ ctx._source.counter += 1...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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用Python编写Scheme解释器

https://github.com/zhangyun00... Lisp的语法非常简单，也许所有程序设计系统中最简单的，只有一种语法，就是 --- (). 而其他系统，总是免不了各种符号因此，我对lisp/scheme产生了兴趣，最近使用 ... 各种函数 -- 内置的或者各种库的函数希望有同学对此感兴趣，帮我提意见或者直接提交代码 ...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Java classes for pyjnius

I have created a Java class to use in python with pyjnius but I can't use it as pyjnius can't find it, the ... me how can I go about using my Java classes with pyjnius please....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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193 views

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F# how do I create an Array/List of Structs

I am very new to F#, and I'm trying to simply get an array of structs where the struct is the filename ... fileTemplates |> JsonConvert.SerializeObject |> printfn "some stuff %s" 0...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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REST API for listing features in Azure App Configuration's Feature Manager

Microsoft offers a RESTful API for Azure App Configuration with the documentation at: https://docs.microsoft.com/en-us/rest ... and I need to be able to query it programmatically....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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这些扩展哪些是laravel能用到的？

我看原来机器上安装了这么多扩展现在换新的机器了这些扩展都是laravel必须用到的吗都要一起安装吗怎么安装比较快我不会编译安 ... sysvmsg sysvsem sysvshm tidy tokenizer wddx xml xmlreader xmlrpc xmlwriter xsl Zend OPcache zip zlib...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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403 views

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vue海康摄像头web 页面开发

我想的是固定在那个地方，而不是随着浏览器滚动而滚动。请问如何修改?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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为什么winscp删除一个大文件很慢，用rm -rf删除这个文件就是秒删？

为什么winscp删除一个大文件很慢，用rm -rf删除这个文件就是秒删？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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181 views

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关于在线聊天功能

前端使用的vue，后端使用thinkphp，打算做一个在线聊天功能，请问应该用什么？网上查到有socket.io和workerman,是后端使用nodejs才能用socket.io吗?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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如何用python多线程从几个网站下载多个文件？

有100个文件，可以从3个网站下载（3个不同函数），如何用python多线程最快下载这些文件？不想用测速再分配任务的办法，有好的办法吗？谢谢！！...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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