如何解组嵌套的未知字段

2024-03-29

我分叉了一个很棒的项目here https://github.com/sridharv/reddit-go/blob/master/types.go,并且刚刚把它弄得一团糟,学习了一些Go。我无法弄清楚的问题是有关自定义解组的一些事情,如果您看到here https://github.com/yawlhead91/reddit-go/blob/682b83c99eda47b95e43d8f69b77a5ed53ac2029/types.go#L29你可以看到这解组了Thing结构体包含一个Data interface{}然后使用解组的字段Kind string场地。除了嵌套情况外,这一切都很好。所以最好的是一个例子:

只要说你有Thing那种结构是 alisting, 就这样Thing.Data这是未编组的类型listing. Then listing has 3 Children类型的link是在Children []Thing场地。这些孩子最终成为了典型的map[string]interface {}这是我的问题。我怎样才能通过嵌套数据进行解组?所以这样Children.Data也未编组。有没有办法在 go 中做到这一点,或者我必须编写一个大循环或递归算法?请告诉我您的想法,或者我对这种情况的看法是否完全错误。谢谢

UPDATE这是一个 json 示例

{
    "kind": "Listing",
    "data": {
        "after": null,
        "dist": 10,
        "facets": {},
        "modhash": null,
        "whitelist_status": "all_ads",
        "children": [
            {
                "kind": "t3",
                "data": {
                    "domain": "self.nanocurrency",
                    "approved_at_utc": null,
                    "mod_reason_by": null,
                    "banned_by": null,
                    "num_reports": null,
                    "subreddit_id": "t5_2wlj3",
                    "thumbnail_width": null,
                    "subreddit": "CryptoCurrency",
                    "selftext_html": null,
                    "selftext": "",
                    "likes": null,
                    "suggested_sort": null,
                    "crosspost_parent_list": [
                        {
                            "domain": "self.nanocurrency",
                            "approved_at_utc": null,
                            "mod_reason_by": null,
                            "banned_by": null,
                            "num_reports": null,
                            "subreddit_id": "t5_4br49",
                            "thumbnail_width": null,
                            "subreddit": "nanocurrency",
                            "selftext_html": "<!-- SC_OFF --><div class=\"md\"><p>Seeing lots of comments about the lack of timestamps in the protocol, and just wanted to provide some information on why objectively accurate, global time timestamps are an illusion in decentralized systems. Logical time on the other hand is achievable and is in fact achieved in Nano via the individual block chains and the directed, acyclic graph (DAG). </p>\n\n<p>Generally, in a decentralized, distributed system, only logical time (C happened after B happened after A) can be agreed on globally (e.g. Lamport time: <a href=\"https://amturing.acm.org/p558-lamport.pdf\">https://amturing.acm.org/p558-lamport.pdf</a> or vector clocks). This is what the nano ledger does via chaining blocks, just as any other blockchain. Then it connects those chains via a DAG. Syncing global time to logical time is a hard problem that can either be approached via a consensus approach which is prone to sybil attacks, via a probabilistic approach which is what most blockchains go with - essentially relying on their peers - or a centralized approach like NTP which is a no-go in a decentralized system. If you're interested, check e.g. this paper: <a href=\"http://soft.vub.ac.be/%7Etvcutsem/distsys/clocks.pdf\">http://soft.vub.ac.be/~tvcutsem/distsys/clocks.pdf</a></p>\n\n<p>So what you're running into is the problem that while theoretically all or a relevant subset of nodes within the Nano or Bitcoin or Ethereum network could agree to call a certain time "Monday February 12 2018 20:35:23", this timestamp could still be incorrect vs the outside world.</p>\n\n<p>That's why any accurate global timestamps in software today rely on centralized information and trusted entities. The only way this can change is if machines start setting their clocks on their own accurately (e.g. chip-scale atomic clocks)</p>\n\n<p>Some people think this is bad news for Nano because in traditional blockchain, timestamps are fairly important because they are used in new block validation: <a href=\"http://culubas.blogspot.co.uk/2011/05/timejacking-bitcoin_802.html\">http://culubas.blogspot.co.uk/2011/05/timejacking-bitcoin_802.html</a> . Timestamps are a blessing and a curse at the same time in blockchain: They allow for timing and validation of blocks and therefore regulation of coin mining, but also allow for timestamp double spend attacks. Since Nano does not use mining, it is not susceptible to those attacks.</p>\n\n<p>Even with the relative importance of time and timestamps in Bitcoin, timestamp in Bitcoin are not guaranteed to be corresponding to logical time on the chain. Here's the bitcoin wiki talking about the bitcoin block timestamp: <a href=\"https://en.bitcoin.it/wiki/Block_timestamp\">https://en.bitcoin.it/wiki/Block_timestamp</a> </p>\n\n<blockquote>\n<p>A timestamp is accepted as valid if it is greater than the median timestamp of previous 11 blocks, and less than the network-adjusted time + 2 hours. "Network-adjusted time" is the median of the timestamps returned by all nodes connected to you. As a result, block timestamps are not exactly accurate, and they do not even need to be in order. Block times are accurate only to within an hour or two. </p>\n</blockquote>\n\n<p>This is probably as good as it gets. Still no ordering guarantees though, and a possibilities for attacks which have been discussed again and again. There are certain guards in Bitcoin code to prevent these from happening. </p>\n\n<p>So if you have somebody lecturing you about how architecturally superior coins would have a accurate and monotonically increasing timestamps, point them here, or here: <a href=\"https://cointelegraph.com/news/timestamp-hacking-debunking-the-myth-of-precision-timestamps\">https://cointelegraph.com/news/timestamp-hacking-debunking-the-myth-of-precision-timestamps</a></p>\n\n<p>Would timestamps be convenient to have on the protocol? Yes, and that would likely be a good reason to include them. Are timestamps accurately depicting global time, and can they be used as evidence in any chain? No they can't.</p>\n\n<p>Why are we seeing inaccurate timestamps in the block explorer? Because these are kept in a db outside of the ledger and have been set January 19. Nothing more to it.</p>\n\n<p>Why do people like to babble about how this is a weakness in Nano? No clue.</p>\n</div><!-- SC_ON -->",
                            "selftext": "Seeing lots of comments about the lack of timestamps in the protocol, and just wanted to provide some information on why objectively accurate, global time timestamps are an illusion in decentralized systems. Logical time on the other hand is achievable and is in fact achieved in Nano via the individual block chains and the directed, acyclic graph (DAG). \n\nGenerally, in a decentralized, distributed system, only logical time (C happened after B happened after A) can be agreed on globally (e.g. Lamport time: https://amturing.acm.org/p558-lamport.pdf or vector clocks). This is what the nano ledger does via chaining blocks, just as any other blockchain. Then it connects those chains via a DAG. Syncing global time to logical time is a hard problem that can either be approached via a consensus approach which is prone to sybil attacks, via a probabilistic approach which is what most blockchains go with - essentially relying on their peers - or a centralized approach like NTP which is a no-go in a decentralized system. If you're interested, check e.g. this paper: http://soft.vub.ac.be/~tvcutsem/distsys/clocks.pdf\n\nSo what you're running into is the problem that while theoretically all or a relevant subset of nodes within the Nano or Bitcoin or Ethereum network could agree to call a certain time \"Monday February 12 2018 20:35:23\", this timestamp could still be incorrect vs the outside world.\n\nThat's why any accurate global timestamps in software today rely on centralized information and trusted entities. The only way this can change is if machines start setting their clocks on their own accurately (e.g. chip-scale atomic clocks)\n\nSome people think this is bad news for Nano because in traditional blockchain, timestamps are fairly important because they are used in new block validation: http://culubas.blogspot.co.uk/2011/05/timejacking-bitcoin_802.html . Timestamps are a blessing and a curse at the same time in blockchain: They allow for timing and validation of blocks and therefore regulation of coin mining, but also allow for timestamp double spend attacks. Since Nano does not use mining, it is not susceptible to those attacks.\n\nEven with the relative importance of time and timestamps in Bitcoin, timestamp in Bitcoin are not guaranteed to be corresponding to logical time on the chain. Here's the bitcoin wiki talking about the bitcoin block timestamp: https://en.bitcoin.it/wiki/Block_timestamp \n\n> A timestamp is accepted as valid if it is greater than the median timestamp of previous 11 blocks, and less than the network-adjusted time + 2 hours. \"Network-adjusted time\" is the median of the timestamps returned by all nodes connected to you. As a result, block timestamps are not exactly accurate, and they do not even need to be in order. Block times are accurate only to within an hour or two. \n\nThis is probably as good as it gets. Still no ordering guarantees though, and a possibilities for attacks which have been discussed again and again. There are certain guards in Bitcoin code to prevent these from happening. \n\nSo if you have somebody lecturing you about how architecturally superior coins would have a accurate and monotonically increasing timestamps, point them here, or here: https://cointelegraph.com/news/timestamp-hacking-debunking-the-myth-of-precision-timestamps\n\nWould timestamps be convenient to have on the protocol? Yes, and that would likely be a good reason to include them. Are timestamps accurately depicting global time, and can they be used as evidence in any chain? No they can't.\n\nWhy are we seeing inaccurate timestamps in the block explorer? Because these are kept in a db outside of the ledger and have been set January 19. Nothing more to it.\n\nWhy do people like to babble about how this is a weakness in Nano? No clue.",
                            "likes": null,
                            "suggested_sort": null,
                            "user_reports": [],
                            "secure_media": null,
                            "is_reddit_media_domain": false,
                            "link_flair_text": null,
                            "id": "7ww6bm",
                            "banned_at_utc": null,
                            "mod_reason_title": null,
                            "view_count": null,
                            "archived": false,
                            "clicked": false,
                            "media_embed": {},
                            "report_reasons": null,
                            "author": "ohlookaballoon",
                            "num_crossposts": 2,
                            "saved": false,
                            "mod_reports": [],
                            "can_mod_post": false,
                            "is_crosspostable": true,
                            "pinned": false,
                            "score": 24,
                            "approved_by": null,
                            "over_18": false,
                            "hidden": false,
                            "thumbnail": "self",
                            "edited": false,
                            "link_flair_css_class": null,
                            "author_flair_css_class": null,
                            "contest_mode": false,
                            "gilded": 0,
                            "downs": 0,
                            "brand_safe": false,
                            "secure_media_embed": {},
                            "removal_reason": null,
                            "author_flair_text": null,
                            "stickied": false,
                            "can_gild": true,
                            "thumbnail_height": null,
                            "parent_whitelist_status": null,
                            "name": "t3_7ww6bm",
                            "spoiler": false,
                            "permalink": "/r/nanocurrency/comments/7ww6bm/why_global_time_objectively_accurate_timestamps/",
                            "subreddit_type": "public",
                            "locked": false,
                            "hide_score": false,
                            "created": 1518417258,
                            "url": "https://www.reddit.com/r/nanocurrency/comments/7ww6bm/why_global_time_objectively_accurate_timestamps/",
                            "whitelist_status": null,
                            "quarantine": false,
                            "title": "Why global time, objectively accurate timestamps are not achievable in decentralized systems",
                            "created_utc": 1518388458,
                            "subreddit_name_prefixed": "r/nanocurrency",
                            "ups": 24,
                            "media": null,
                            "num_comments": 18,
                            "is_self": true,
                            "visited": false,
                            "mod_note": null,
                            "is_video": false,
                            "distinguished": null
                        }
                    ],
                    "user_reports": [],
                    "secure_media": null,
                    "is_reddit_media_domain": false,
                    "link_flair_text": null,
                    "id": "7x3r45",
                    "banned_at_utc": null,
                    "mod_reason_title": null,
                    "view_count": null,
                    "archived": false,
                    "clicked": false,
                    "media_embed": {},
                    "report_reasons": null,
                    "author": "ohlookaballoon",
                    "num_crossposts": 0,
                    "saved": false,
                    "mod_reports": [],
                    "can_mod_post": false,
                    "is_crosspostable": true,
                    "pinned": false,
                    "score": 2,
                    "approved_by": null,
                    "over_18": false,
                    "hidden": false,
                    "thumbnail": "default",
                    "edited": false,
                    "link_flair_css_class": null,
                    "author_flair_css_class": "New",
                    "contest_mode": false,
                    "gilded": 0,
                    "downs": 0,
                    "brand_safe": true,
                    "secure_media_embed": {},
                    "removal_reason": null,
                    "author_flair_text": "Redditor for 27 days.",
                    "stickied": false,
                    "can_gild": true,
                    "thumbnail_height": null,
                    "parent_whitelist_status": "all_ads",
                    "name": "t3_7x3r45",
                    "crosspost_parent": "t3_7ww6bm",
                    "spoiler": false,
                    "permalink": "/r/CryptoCurrency/comments/7x3r45/why_global_time_objectively_accurate_timestamps/",
                    "subreddit_type": "public",
                    "locked": false,
                    "hide_score": false,
                    "created": 1518496223,
                    "url": "https://np.reddit.com/r/nanocurrency/comments/7ww6bm/why_global_time_objectively_accurate_timestamps/",
                    "whitelist_status": "all_ads",
                    "quarantine": false,
                    "title": "Why global time, objectively accurate timestamps are not achievable in decentralized systems",
                    "created_utc": 1518467423,
                    "subreddit_name_prefixed": "r/CryptoCurrency",
                    "ups": 2,
                    "media": null,
                    "num_comments": 0,
                    "is_self": false,
                    "visited": false,
                    "mod_note": null,
                    "is_video": false,
                    "distinguished": null
                }
            },

这正是json.RawMessage https://golang.org/pkg/encoding/json/#RawMessage是用于(查看文档中的 unmarshal 示例)。首先解组 JSON 对象的顶层,检查 kind 字段,然后解组数据字段:

type Listing struct {                                           
    WhitelistStatus string  `json:"whitelist_status"`           
    Children        []Thing `json:"children"`                   
}                                                               

type T3 struct {                                                
    Domain              string `json:"domain"`                  
    CrosspostParentList []struct {                              
            Domain string `json:"domain"`                       
    } `json:"crosspost_parent_list"`                            
}                                                               

type Thing struct {
    Kind string      `json:"kind"`
    Data interface{} `json:"data"`
}

func (t *Thing) UnmarshalJSON(b []byte) error {
    var step1 struct {
            Kind string          `json:"kind"`
            Data json.RawMessage `json:"data"` 
    }

    if err := json.Unmarshal(b, &step1); err != nil {
            return err
    }

    var step2 interface{}
    switch step1.Kind {
    case "Listing":
            step2 = &Listing{}
    case "t3":
            step2 = &T3{}
    default:
            return errors.New("unknown kind: " + step1.Kind) // or simply ignore
    }

    if err := json.Unmarshal(b, step2); err != nil {
            return err
    }

    t.Kind = step1.Kind
    t.Data = step2

    return nil
}

在操场上尝试一下:https://play.golang.org/p/giBVT2IWPd- https://play.golang.org/p/giBVT2IWPd-

本文内容由网友自发贡献,版权归原作者所有,本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容,请联系:hwhale#tublm.com(使用前将#替换为@)

如何解组嵌套的未知字段 的相关文章

  • Golang:使用像 Node.js 中那样的可读流从 PostgreSQL 数据库中选择几百万行

    我有大约 5000 万行的 PostgreSQL 表 我想编写 Go 代码来从该表中选择大约 100 万行 并以有效的方式处理它们 上次我使用了nodejs和这个NPM模块pg 查询流 https www npmjs com package
  • Golang 从管道读取读取大量数据

    我正在尝试读取一个正在被焦油化 流式传输到标准输入的存档 但我正在以某种方式读取far管道中的数据多于 tar 发送的数据 我像这样运行我的命令 tar cf somefolder my go binary 源代码是这样的 package
  • 无法将字符串解组为 int64 类型的 Go 值

    我有结构 type tySurvey struct Id int64 json id omitempty Name string json name omitempty I do json Marshal在 HTML 页面中写入 JSON
  • golang sql 驱动程序的准备语句

    关于golang的sql driver 下面两条语句有什么区别 store DB is sql DB type rows err store DB Query SQL args err nil defer rows Close and st
  • 从 Go Slice 中选择一个随机值

    情况 我有一些值 需要从中随机选择一个值 然后我想将它与固定字符串连接起来 到目前为止 这是我的代码 func main create the reasons slice and append reasons to it reasons m
  • 数据库连接最佳实践

    我有一个使用 net http 的应用程序 我使用 http 注册了一些处理程序 这些处理程序需要从数据库中获取一些内容 然后才能继续编写响应并完成请求 我的问题是连接到该数据库的最佳实践是什么 我希望它能够以每分钟 1 个请求或每秒 10
  • runtime.LockOSThread 是否允许子 goroutine 在同一个操作系统线程中运行?

    我明白在 Go 中 runtime LockOSThread https golang org pkg runtime LockOSThread将一个 goroutine 绑定到一个操作系统线程 并且不允许其他 goroutine 在该线程
  • Golang、mysql:错误1040:连接过多

    我正在使用 github com go sql driver mysql 驱动程序 我打开一个数据库 db err sql Open mysql str 然后我有两个函数 每个函数被调用 200 次 并使用以下 mysql 代码 rows
  • java.lang.NoSuchMethodError:com.fasterxml.jackson.databind.type。使用 apache beam Spark runner 运行 go 示例时

    我想跑grades https github com apache beam tree master sdks go examples gradesapache beam go sdk 提出的示例 在一个主服务器和两个从服务器 spark2
  • GoLang - 坚持使用 ISO-8859-1 字符集

    我正在开发一个项目 我们需要将信息保存在具有 ISO 8859 1 表的旧数据库中 因此 在向数据库写入内容之前 我需要将其从 UTF 8 转换为 ISO 8859 1 每次从数据库检索它时 我都需要将其转换回 UTF 8 我试图使用图书馆
  • go 中的属性更改通知

    如何在 go 中向多个接收器发出 属性 更改信号 类似于在 Qt 中使用通知信号定义属性的方式 例如 如果您想象有一些值需要以多种方式显示 例如进度值可以同时显示为进度条和文本 当基础值发生变化时 两者都需要更新 一种方法可能是利用chan
  • Go MSSQL 连接

    如何提供 MSSQL 连接 它说它始终与代码相关 即使信息不正确 也不会报错 package main import database sql fmt github com denisenkom go mssqldb log var ser
  • 使用 crypto/ssh 的 golang scp 文件

    我正在尝试通过 ssh 下载远程文件 以下方法在 shell 上运行良好 ssh hostname tar cz opt local folder gt folder tar gz 然而 golang 上的相同方法在输出工件大小方面存在一些
  • 如何在golang模板上打印JSON?

    我需要在客户端有一个对象 所以我使用 json marshal 将其转换为 JSON 并将其打印到模板中 该对象被打印为转义 JSON 字符串 我期待它是var arr o1 o2 但它是var arr o1 o2 我知道我可以在客户端进行
  • 我可以根据我正在构建的操作系统导入 Golang 包吗?

    假设我有一个基于哪个操作系统的 go 项目 在某些情况下是哪个发行版 我想使用 Systemd 客户端包 Upstart 客户端包 sysv 客户端包 launchd 客户端包 是否可以有选择地导入每个包 以便我只导入我正在构建的每个操作系
  • 完全删除使用“go get”安装的软件包?

    我正在使用 Go 1 13 1 最新版本 我正在尝试完全删除我安装的软件包go get来自 GitHub 这go clean i
  • Gorm 总是返回带有 nil 值的结构

    我正在使用 Gorm 构建 Go Web API 作为 Amazon RDS 中 Postgresql 数据库的 ORM 问题是 Gorm 总是返回一片结构 其值全部为零 尽管数据库已经填充了数据 切片中的结构体数量是否合适取决于LIMIT
  • 为什么 Go 中只有 int 而没有 float?

    在 Go 中 有这样的类型int这可能相当于int32 or int64取决于系统架构 我可以声明一个整数变量而不用担心它的大小 var x int 为什么没有这个类型float 这相当于float32 or float64取决于我的系统架
  • (转)如何使用toml文件?

    正如标题 我想知道如何使用 golang 中的 toml 文件 在此之前 我展示了我的 toml 示例 这样对吗 datatitle enable true userids 12345 67890 datatitle 12345 prop1
  • Golang中如何获得100%的代码覆盖率? [复制]

    这个问题在这里已经有答案了 我无法获得 100 的代码覆盖率 因为我无法在 Golang 中测试 Fatals 我发现了一些问答 包括this one https stackoverflow com questions 30688554 h

随机推荐

  • 使用 Python 将 HTML 转为 RTF 字符串

    我正在寻找一种将 HTML 文本转换为 RTF 字符串的方法 有没有任何图书馆可以完成这项工作 我在项目中动态获取 html 内容 并需要将其以 RTF 格式呈现 我正在使用 HTML 解析器将 HTML 文本转换为普通字符串 然后尝试使用
  • Boost.Python - 向量到 Numpy 数组

    我有以下课程 class PyWav public static inline boost python object sdVecToNumpyArray std vector
  • 如何模拟 DefaultCellEditor 的“onStartCellEditing”

    CellEditorListener 有 editingStopped 和 editingCancelled 但是 我如何实现在单元格编辑会话开始时需要运行的一段代码呢 一个典型的示例可能是 当您开始编辑时 您希望 JTextField 编
  • 使用 SQL Server 2016 批量导入 Unicode

    由于我们已经迁移到 SQL Server 2016 我们现在尝试使用非 XML 格式文件和 UTF 8 编码数据文件 使用换行符 Unix LF 通过 BULK IMPORT 将 Unicode 字符导入表中 格式文件指定主机文件数据长度
  • Javafx 删除应用程序启动时的快速白屏

    使用 javafx 7 更新 60 操作系统 Windows 7 我刚刚从那里获取了 helloworldhttp docs oracle com javafx 2 get started hello world htm http docs
  • 如何在客户端使用 Java 读取 gRPC 中的元数据

    我正在使用 Java 和 Protoc 3 0 编译器 我的 proto 文件如下所述 https github com openconfig public blob master release models rpc openconfig
  • 具有多个视图的 Durandal 小部件

    我正在使用 Durandal 开发 SPA 并且我创建了一个用于显示特定页面组件的小部件 继杜兰达尔文档 http durandaljs com documentation Creating A Widget 小部件位于app widget
  • 当图像不存在时,如何使用 CSS 隐藏替代文本?

    是否可以在所有浏览器中使用 CSS 隐藏替代文本 我尝试过color transparent 它适用于除 IE 之外的所有浏览器 可以在 IE 中使用 CSS 实现吗 预先感谢您的任何帮助 怎么样使用font size 0 它在隐藏中起作用
  • 使用 javascript 永久更改 :root .css 变量(通过输入获取变量信息)

    我正在为我正在创建的这个网站开发一个想法 这个想法基本上是要求用户提供颜色输入 12345 一旦输入 用户就会提交输入 这将在所有内容中永久更改 css 变量页 这是我的代码 HTML div class adminpage backgro
  • 无法将 DrawerLayout 放在 StatusBar 下

    我有一个活动Navigation Drawer并使用ScrimInsetsFrameLayout我能够将布局放在StatusBar一切都很顺利 然后我决定更换颜色Toolbar and StatusBar with a png所有活动布局的
  • 如何将 3D 模型从 Cinema4D 导出到 Three.js?

    如果我有一个网格建模4D影院 我怎样才能将其导出three js http github com mrdoob three js3D JS 引擎 另外 导出材料也很方便colors for 多边形选择 为此 我刚刚为 Cinema4D 编写
  • 在VBA中处理错误时如何管理无错误情况? [复制]

    这个问题在这里已经有答案了 我需要使用以下命令捕获一些 VBA 错误GoTo陈述 Sub mySub On Error GoTo errorHandler Workbooks Open myWorkbook Some Code errorH
  • 更改 ggplot 中某些类别的线型?

    我有一些数据 library reshape2 library ggplot2 df data frame cat LETTERS 1 6 VAR1 runif 6 VAR2 runif 6 VAR3 runif 6 VAR4 runif
  • Bash 脚本:使用 Expect 将文件发送到 SFTP

    我必须将一些 gzip 压缩文件从本地服务器发送到 SFTP 服务器 我的服务器信息 发行商 ID Ubuntu 说明 Ubuntu 12 04 4 LTS 发布 12 04 代号 精确 创建了一个 bash 脚本 并且能够将文件发送到 s
  • 仅绘制 QPainter Path 贝塞尔曲线的部分

    我只想绘制 QPainter 曲线路径的一部分 我的路径是这样的 QPointF p 4 p 0 QPoint 100 200 p 1 QPoint 200 60 p 2 QPoint 500 180 p 3 QPoint 600 100
  • 训练鲁棒级联分类器时要考虑的建议?

    我正在训练级联分类器以检测图像中的动物 不幸的是 我的误报率相当高 使用 Haar 和 LBP 超高 使用 HOG 可以接受 我想知道如何改进我的分类器 这是我的问题 鲁棒检测所需的训练样本量是多少 我在某处读到需要 4000 个正样本和
  • R 控制台可以支持后台任务或中断(事件处理)吗?

    在 R 控制台中工作时 我想设置一个后台任务来监视特定连接 并在发生事件时执行另一个函数 警报 或者 我可以进行设置 以便外部函数仅向 R 发送警报 但这似乎是同一个问题 有必要设置一个侦听器 我可以在 R 的专用进程中执行此操作 但我不知
  • 创建对象时抛出异常

    执行catch语句时是否会创建异常对象 例如 catch ArithmeticException someObject 该对象是否不必显式创建为实例 有两件事创建异常的实例第二抛出异常 创建异常的实例例如 看起来像创建类的任何实例NullP
  • Ansible 中的角色和任务(和标签)有什么区别?

    我发现自己很困惑roles and tasks每时每刻 我知道标签是标记单个项目的一种方式 但我很困惑如何使用它们 假设我必须执行以下操作 Users Create a user named deploy Add ssh key for d
  • 如何解组嵌套的未知字段

    我分叉了一个很棒的项目here https github com sridharv reddit go blob master types go 并且刚刚把它弄得一团糟 学习了一些Go 我无法弄清楚的问题是有关自定义解组的一些事情 如果您看