< 2025年3月 > 日 一 二 三 四 五 六 23 24 25 26 27 28 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 1 2 3 4 5

导航

• 博客园
• 首页
• 新随笔
• 新文章
• 联系
• 管理

• 随笔 - 754
• 文章 - 38
• 评论 - 0
• 阅读 - 54032

06 2024 档案

• curl works but http.Get fails with error: dial tcp: lookup locahost on 127.0.0.53:53: server misbehaving
  摘要：zzh@ZZHPC:/zdata/Github/mastering-go-expertise/stats_web/server$go run . Ready to serve at :1234 zzh@ZZHPC:~$ curl localhost:1234/list d6 4 2.325000 阅读全文
  posted @ 2024-06-26 17:41 ZhangZhihuiAAA 阅读(87) 评论(0) 推荐(0) 编辑
• Docker Compose - deploy stats_server
  摘要：services: stats_server: image: stats_server container_name: stats_server restart: always ports: - 1234:1234 networks: - stats networks: stats: driver: 阅读全文
  posted @ 2024-06-25 22:24 ZhangZhihuiAAA 阅读(6) 评论(0) 推荐(0) 编辑
• Dockerfile - build stats_server
  摘要：FROM golang:alpine AS builder # Install git. # Git is required for fetching the dependencies. RUN apk update && apk add --no-cache git RUN mkdir $GOPA 阅读全文
  posted @ 2024-06-25 21:53 ZhangZhihuiAAA 阅读(5) 评论(0) 推荐(0) 编辑
• Cobra - Flags are parsed in rootCmd.Execute()
  摘要：root.go: func init() { rootCmd.PersistentFlags().BoolVarP(&enableLogging, "log", "l", true, "Logging information") fmt.Println("********************** 阅读全文
  posted @ 2024-06-23 23:43 ZhangZhihuiAAA 阅读(7) 评论(0) 推荐(0) 编辑
• VSCode - gopls error
  摘要：[Error - 5:36:50 PM] Request textDocument/semanticTokens/range failed. Message: semantictokens are disabled Code: 0 [Error - 5:36:50 PM] Request textD 阅读全文
  posted @ 2024-06-23 18:06 ZhangZhihuiAAA 阅读(60) 评论(0) 推荐(0) 编辑
• VSCode - settings.json
  摘要：{ "workbench.startupEditor": "none", "[go]": { "editor.insertSpaces": true, "editor.formatOnSave": false }, "editor.fontSize": 16, "terminal.integrate 阅读全文
  posted @ 2024-06-20 17:34 ZhangZhihuiAAA 阅读(8) 评论(0) 推荐(0) 编辑
• Go - The log/slog package
  摘要：package main import ( "fmt" "log/slog" "os" ) func main() { slog.Error("This is an ERROR message") slog.Debug("This is a DEBUG message") slog.Info("Th 阅读全文
  posted @ 2024-06-20 10:10 ZhangZhihuiAAA 阅读(3) 评论(0) 推荐(0) 编辑
• Cobra
  摘要：zzh@ZZHPC:/zdata/Github/mastering-go-expertise$cd go-cobra/ zzh@ZZHPC:/zdata/Github/mastering-go-expertise/go-cobra$ cobra-cli init Error: invalid ch 阅读全文
  posted @ 2024-06-19 09:12 ZhangZhihuiAAA 阅读(69) 评论(0) 推荐(0) 编辑
• Python - Arrays and Numpy Arrays
  摘要：Most programming languages provide a data structure called arrays. In Python, array is a package and it is different from “core” python lists. The syn 阅读全文
  posted @ 2024-06-18 16:36 ZhangZhihuiAAA 阅读(6) 评论(0) 推荐(0) 编辑
• Data Analytics
  摘要：Types of Measurement Scales Data Analytic Process 1. Understanding the Business This step involves understanding the objectives and requirements of a 阅读全文
  posted @ 2024-06-18 16:05 ZhangZhihuiAAA 阅读(13) 评论(0) 推荐(0) 编辑
• Python - debugging
  摘要：Python provides a native debugger called Python debugger (Pdb). It is one of the default debuggers that come bundled with Python. What is the use of P 阅读全文
  posted @ 2024-06-18 15:58 ZhangZhihuiAAA 阅读(7) 评论(0) 推荐(0) 编辑
• Python - exception
  摘要： 阅读全文
  posted @ 2024-06-18 15:39 ZhangZhihuiAAA 阅读(8) 评论(0) 推荐(0) 编辑
• Python - import
  摘要：Usage of Dot "." Operator in Relative Import In the above code, "..module4" represents that module4 is present in the parent folder to the current loc 阅读全文
  posted @ 2024-06-18 11:39 ZhangZhihuiAAA 阅读(5) 评论(0) 推荐(0) 编辑
• Python - Meta Class
  摘要：As part of metaprogramming, a metaclass is one of the most important concepts in Python. A Class in Python defines the functionality of its objects us 阅读全文
  posted @ 2024-06-18 11:35 ZhangZhihuiAAA 阅读(8) 评论(0) 推荐(0) 编辑
• Python - class Method and static Method
  摘要：The methods in a class are associated with the objects created for it. For invoking the methods defined inside the class, the presence of an instance 阅读全文
  posted @ 2024-06-17 22:22 ZhangZhihuiAAA 阅读(6) 评论(0) 推荐(0) 编辑
• Python - Overloading
  摘要：Object Oriented Programming (OOP) allows the programmers to add some additional functionalities to the operators and methods which have basic properti 阅读全文
  posted @ 2024-06-17 21:56 ZhangZhihuiAAA 阅读(13) 评论(0) 推荐(0) 编辑
• Python - Name Mangling
  摘要：Name mangling is the process of naming the variable using the prefix "__" (double underscore), which makes the variable can be accessed only by using 阅读全文
  posted @ 2024-06-17 21:34 ZhangZhihuiAAA 阅读(12) 评论(0) 推荐(0) 编辑
• Functional Programming
  摘要：Advantages and Disadvantages of Functional Programming 阅读全文
  posted @ 2024-06-17 21:27 ZhangZhihuiAAA 阅读(4) 评论(0) 推荐(0) 编辑
• Python - Regular Expressions
  摘要：re Package methods Character Class Regular expression with description 阅读全文
  posted @ 2024-06-17 21:20 ZhangZhihuiAAA 阅读(5) 评论(0) 推荐(0) 编辑
• Python - Key Differences between the Single and Double Quotes
  摘要： 阅读全文
  posted @ 2024-06-17 21:14 ZhangZhihuiAAA 阅读(4) 评论(0) 推荐(0) 编辑
• Python - String Format
  摘要：>>> format_string=("%2f" %13.333222) >>> print(format_string) 13.333222 >>> format_string=("%2.3f" %13.333222) >>> print(format_string) 13.333 >>> nam 阅读全文
  posted @ 2024-06-17 19:33 ZhangZhihuiAAA 阅读(3) 评论(0) 推荐(0) 编辑
• Python - Escape Characters
  摘要： 阅读全文
  posted @ 2024-06-17 19:31 ZhangZhihuiAAA 阅读(4) 评论(0) 推荐(0) 编辑
• Python - Operator Precedence
  摘要：>>> help() help> PRECEDENCE Operator precedence ******************* The following table summarizes the operator precedence in Python, from highest pre 阅读全文
  posted @ 2024-06-17 19:27 ZhangZhihuiAAA 阅读(24) 评论(0) 推荐(0) 编辑
• Python - list keywords
  摘要：>>> import keyword>>> keyword.kwlist['False', 'None', 'True', 'and', 'as', 'assert', 'async', 'await', 'break', 'class', 'continue', 'def', 'del', 'el 阅读全文
  posted @ 2024-06-17 18:29 ZhangZhihuiAAA 阅读(6) 评论(0) 推荐(0) 编辑
• Go - scan
  摘要：func getUserInput() { fmt.Print("Please give me your name: ") var name string // Scan scans text read from standard input, storing successive space-se 阅读全文
  posted @ 2024-06-17 11:37 ZhangZhihuiAAA 阅读(4) 评论(0) 推荐(0) 编辑
• Shell - command line arguments
  摘要：zzh@ZZHPC:~/.goenv/shims$cat godoc #!/usr/bin/env bash set -e [ -n "$GOENV_DEBUG" ] && set -x program="${0##*/}" if [[ "$program" = "go"* ]]; then fo 阅读全文
  posted @ 2024-06-17 10:14 ZhangZhihuiAAA 阅读(4) 评论(0) 推荐(0) 编辑
• Linux - set
  摘要：zzh@ZZHPC:~$ help set set: set [-abefhkmnptuvxBCHP] [-o option-name] [--] [arg ...] Set or unset values of shell options and positional parameters. Ch 阅读全文
  posted @ 2024-06-16 22:47 ZhangZhihuiAAA 阅读(13) 评论(0) 推荐(0) 编辑
• Go - How to remove a module
  摘要：You can remove a module from go.mod using none as follows: $ go get github.com/rabbitmq/amqp091-go@nonego: removed github.com/rabbitmq/amqp091-go v1.8 阅读全文
  posted @ 2024-06-16 17:18 ZhangZhihuiAAA 阅读(12) 评论(0) 推荐(0) 编辑
• RabbitMQ
  摘要：docker-compose.yml: services: rabbitmq: image: 'rabbitmq:3.13-management' container_name: rabbitmq ports: - '5672:5672' - '15672:15672' environment: A 阅读全文
  posted @ 2024-06-14 15:50 ZhangZhihuiAAA 阅读(4) 评论(0) 推荐(0) 编辑
• Go - websocket
  摘要：server.go: package main import ( "fmt" "log" "net/http" "os" "time" "github.com/gorilla/websocket" ) var port = ":1234" var upgrader = websocket.Upgra 阅读全文
  posted @ 2024-06-13 21:29 ZhangZhihuiAAA 阅读(6) 评论(0) 推荐(0) 编辑
• Go - semaphore
  摘要：package main import ( "context" "fmt" "os" "strconv" "time" "golang.org/x/sync/semaphore" ) func worker(n int) int { square := n * n time.Sleep(time.S 阅读全文
  posted @ 2024-06-13 20:26 ZhangZhihuiAAA 阅读(16) 评论(0) 推荐(0) 编辑
• Go - Receiving from a closed channel
  摘要：Reading from a closed channel returns the zero value of its data type. However, if you try to write to a closed channel, your program is going to cras 阅读全文
  posted @ 2024-06-13 19:36 ZhangZhihuiAAA 阅读(7) 评论(0) 推荐(0) 编辑
• Go - pflag and viper
  摘要：pflag is a drop-in replacement of Go's native flag package. If you import pflag under the name "flag" then all code should continue to function with n 阅读全文
  posted @ 2024-06-12 16:55 ZhangZhihuiAAA 阅读(3) 评论(0) 推荐(0) 编辑
• Zgo - Writing to a file
  摘要：package main import ( "bufio" "fmt" "io" "os" ) func main() { buffer := []byte("Data to write\n") f1, err := os.Create("f1.txt") if err != nil { fmt.P 阅读全文
  posted @ 2024-06-12 14:37 ZhangZhihuiAAA 阅读(5) 评论(0) 推荐(0) 编辑
• Go - Reading from /dev/random
  摘要：The purpose of the /dev/random system device is to generate random data, which you might use to test your programs or, in this case, as the seed for a 阅读全文
  posted @ 2024-06-12 14:13 ZhangZhihuiAAA 阅读(5) 评论(0) 推荐(0) 编辑
• Zgo - Read text files
  摘要：package main import ( "bufio" "fmt" "io" "os" ) func lineByLine(file string) error { f, err := os.Open(file) if err != nil { return err } defer f.Clos 阅读全文
  posted @ 2024-06-12 10:53 ZhangZhihuiAAA 阅读(7) 评论(0) 推荐(0) 编辑
• Zgo - go-sqlite3
  摘要：package main import ( "database/sql" "fmt" "os" _ "github.com/mattn/go-sqlite3" ) func main() { // Connect or create a SQLite database db, err := sql. 阅读全文
  posted @ 2024-06-11 20:02 ZhangZhihuiAAA 阅读(4) 评论(0) 推荐(0) 编辑
• Go - Order of execution
  摘要：If there are multiple init() functions in a package, don't use in an init() function a global variable that is initialized in another init() function, 阅读全文
  posted @ 2024-06-11 19:47 ZhangZhihuiAAA 阅读(4) 评论(0) 推荐(0) 编辑
• Go - The map[string]interface{} map
  摘要：Remember that the biggest advantage you get from using a map[string]interface{} map, or any map that stores an interface{} value in general, is that y 阅读全文
  posted @ 2024-06-11 19:27 ZhangZhihuiAAA 阅读(5) 评论(0) 推荐(0) 编辑
• Go - reflect
  摘要：package main import ( "fmt" "reflect" ) type Secret struct { Username string Password string } type Record struct { Field1 string Field2 float64 Field 阅读全文
  posted @ 2024-06-11 17:07 ZhangZhihuiAAA 阅读(4) 评论(0) 推荐(0) 编辑
• Zgo - maps
  摘要：package main import ( "fmt" "maps" ) func delete(k string, v int) bool { return v%2 != 0 } func equal(v1 int, v2 float64) bool { return float64(v1) == 阅读全文
  posted @ 2024-06-11 11:35 ZhangZhihuiAAA 阅读(12) 评论(0) 推荐(0) 编辑
• Zgo - slices
  摘要：package main import ( "fmt" "slices" ) func main() { s1 := []int{1, 2, -1, -2} s2 := slices.Clone(s1) fmt.Printf("%p\n", s1) fmt.Printf("%p\n", s2) s1 阅读全文
  posted @ 2024-06-11 11:22 ZhangZhihuiAAA 阅读(6) 评论(0) 推荐(0) 编辑
• Go - Generics
  摘要： 阅读全文
  posted @ 2024-06-11 10:12 ZhangZhihuiAAA 阅读(5) 评论(0) 推荐(0) 编辑
• Zgo - csv_data.go
  摘要：package main import ( "encoding/csv" "log" "os" ) type Record struct { Name string Surname string Number string LastAccess string } var myData = []Rec 阅读全文
  posted @ 2024-06-10 20:58 ZhangZhihuiAAA 阅读(3) 评论(0) 推荐(0) 编辑
• Go - Regular Expressions
  摘要： 阅读全文
  posted @ 2024-06-10 20:16 ZhangZhihuiAAA 阅读(2) 评论(0) 推荐(0) 编辑
• Zgo - randInt, randString
  摘要：package main import ( crand "crypto/rand" "encoding/base64" "fmt" mrand "math/rand" "strings" ) const ( // As we only want to get printable ASCII char 阅读全文
  posted @ 2024-06-10 17:40 ZhangZhihuiAAA 阅读(6) 评论(0) 推荐(0) 编辑
• Zgo - custom_log.go
  摘要：package main import ( "fmt" "io" "log" "os" "path" ) func main() { flag := os.O_APPEND | os.O_CREATE | os.O_WRONLY logFile := path.Join(os.TempDir(), 阅读全文
  posted @ 2024-06-10 15:36 ZhangZhihuiAAA 阅读(5) 评论(0) 推荐(0) 编辑
• Zgo - which.go
  摘要：package main import ( "fmt" "os" "path/filepath" ) func main() { args := os.Args if len(args) == 1 { fmt.Println("Please provide an argument!") return 阅读全文
  posted @ 2024-06-10 15:27 ZhangZhihuiAAA 阅读(4) 评论(0) 推荐(0) 编辑
• Go - Using error variables to differentiate between input types
  摘要：package main import ( "fmt" "os" "strconv" ) func main() { arguments := os.Args if len(arguments) == 1 { fmt.Println("Not enough arguments") } var tot 阅读全文
  posted @ 2024-06-09 21:37 ZhangZhihuiAAA 阅读(4) 评论(0) 推荐(0) 编辑
• Go - Global Variables
  摘要： 阅读全文
  posted @ 2024-06-09 21:00 ZhangZhihuiAAA 阅读(5) 评论(0) 推荐(0) 编辑
• Go - defer
  摘要：由上可以看出，当return语句中有函数调用时，先执行return中调用的函数，再执行defer的语句。 用Ctrl+C中断程序运行时defer语句不会被自动执行。 阅读全文
  posted @ 2024-06-04 20:09 ZhangZhihuiAAA 阅读(4) 评论(0) 推荐(0) 编辑