在Go语言中打印表格的高效方法是什么？

huangapple
go评论132阅读模式
英文:

The efficient way to print a table in GO

问题

我想知道在Go语言中打印表格的简单高效的方法。我找到的解决方案虽然可行，但非常丑陋。

非常感谢！

  1. outfile := "file.tsv"
  2. f, err := os.Create(outfile)
  3. var buffer bytes.Buffer
  5. buffer.WriteString(a[i])
  6. buffer.WriteString("\t")
  7. buffer.WriteString(a[j])
  8. buffer.WriteString("\t")
  9. buffer.WriteString(strconv.FormatFloat(x, 'f', 4, 64))
  10. buffer.WriteString("\n")
  11. // 将结果写入文件
  12. f.WriteString(buffer.String())
英文:

I would like to know a simple and efficient way to print a table in Go. The solution I found works but it is really ugly.

many Thanks !

  1. outfile := "file.tsv"
  2. f, err := os.Create(outfile)
  3. var buffer bytes.Buffer
  5. buffer.WriteString(a[i])
  6. buffer.WriteString("\t")
  7. buffer.WriteString(a[j])
  8. buffer.WriteString("\t")
  9. buffer.WriteString(strconv.FormatFloat(x, 'f', 4, 64))
  10. buffer.WriteString("\n")
  11. // // write results to outfile
  12. f.WriteString(buffer.String())

答案1

得分: 43

tabwriter 包是标准库中用于这种情况的简单易用的工具：

  1. w := tabwriter.NewWriter(os.Stdout, 1, 1, 1, ' ', 0)
  2. fmt.Fprintln(w, "a\tb\tc\td\t")
  3. fmt.Fprintln(w, "aa\tbb\tcc\t")
  4. fmt.Fprintln(w, "aaa\tbbb\tccc\t")
  5. fmt.Fprintln(w, "aaaa\tbbbb\tcccc\tdddd\t")
  6. w.Flush()
  8. // 输出结果：
  9. // a    b    c    d 
  10. // aa   bb   cc   
  11. // aaa  bbb  ccc  
  12. // aaaa bbbb cccc dddd

你可以将 os.Stdout 替换为任何 io.Writer。

英文:

The tabwriter package in the standard library is simple and easy for this kind of thing:

  1. w := tabwriter.NewWriter(os.Stdout, 1, 1, 1, ' ', 0)
  2. fmt.Fprintln(w, "a\tb\tc\td\t")
  3. fmt.Fprintln(w, "aa\tbb\tcc\t")
  4. fmt.Fprintln(w, "aaa\tbbb\tccc\t")
  5. fmt.Fprintln(w, "aaaa\tbbbb\tcccc\tdddd\t")
  6. w.Flush()
  8. // Prints out:
  9. // a    b    c    d 
  10. // aa   bb   cc   
  11. // aaa  bbb  ccc  
  12. // aaaa bbbb cccc dddd

You can replace the os.Stdout with any io.Writer.

答案2

得分: 4

例如，

  1. package main
  3. import (
  4.     "encoding/csv"
  5.     "fmt"
  6.     "os"
  7.     "strconv"
  8. )
  10. func main() {
  11.     outfile := "file.tsv"
  12.     f, err := os.Create(outfile)
  13.     if err != nil {
  14.         fmt.Println(err)
  15.         os.Exit(1)
  16.     }
  17.     defer f.Close()
  18.     w := csv.NewWriter(f)
  19.     defer w.Flush()
  20.     w.Comma = '\t'
  22.     a := []string{"a", "b"}
  23.     i, j := 0, 1
  24.     x := float64(2.7)
  26.     // 写入行
  27.     err = w.Write(
  28.         []string{
  29.             a[i], a[j],
  30.             strconv.FormatFloat(x, 'f', 4, 64),
  31.         },
  32.     )
  33.     if err != nil {
  34.         fmt.Println(err)
  35.     }
  36. }

输出：

  1. $ cat file.tsv
  2. a    b    2.7000
  3. $

如果你使用goroutines，这是一个使用互斥锁保护csv.Writer的版本。

  1. package main
  3. import (
  4.     "encoding/csv"
  5.     "fmt"
  6.     "os"
  7.     "strconv"
  8.     "sync"
  9. )
  11. type csvWriter struct {
  12.     w *csv.Writer
  13.     m sync.Mutex
  14. }
  16. func (c *csvWriter) write(rec []string) error {
  17.     c.m.Lock()
  18.     defer c.m.Unlock()
  19.     return c.w.Write(rec)
  20. }
  22. func (c *csvWriter) flush() {
  23.     c.m.Lock()
  24.     defer c.m.Unlock()
  25.     c.w.Flush()
  26. }
  28. func main() {
  29.     outfile := "file.tsv"
  30.     f, err := os.Create(outfile)
  31.     if err != nil {
  32.         fmt.Println(err)
  33.         os.Exit(1)
  34.     }
  35.     defer f.Close()
  36.     w := csvWriter{w: csv.NewWriter(f)}
  37.     defer w.flush()
  38.     w.w.Comma = '\t'
  40.     a := []string{"a", "b"}
  41.     i, j := 0, 1
  42.     x := float64(2.7)
  44.     // 写入行
  45.     err = w.write(
  46.         []string{
  47.             a[i], a[j],
  48.             strconv.FormatFloat(x, 'f', 4, 64),
  49.         },
  50.     )
  51.     if err != nil {
  52.         fmt.Println(err)
  53.     }
  54. }
英文:

For example,

  1. package main
  3. import (
  4. 	"encoding/csv"
  5. 	"fmt"
  6. 	"os"
  7. 	"strconv"
  8. )
  10. func main() {
  11. 	outfile := "file.tsv"
  12. 	f, err := os.Create(outfile)
  13. 	if err != nil {
  14. 		fmt.Println(err)
  15. 		os.Exit(1)
  16. 	}
  17. 	defer f.Close()
  18. 	w := csv.NewWriter(f)
  19. 	defer w.Flush()
  20. 	w.Comma = '\t'
  22. 	a := []string{"a", "b"}
  23. 	i, j := 0, 1
  24. 	x := float64(2.7)
  26. 	// Write row.
  27. 	err = w.Write(
  28. 		[]string{
  29. 			a[i], a[j],
  30. 			strconv.FormatFloat(x, 'f', 4, 64),
  31. 		},
  32. 	)
  33. 	if err != nil {
  34. 		fmt.Println(err)
  35. 	}
  36. }

Output:

  1. $ cat file.tsv
  2. a	b	2.7000
  3. $

If you use goroutines, here's a version that uses a mutex to protect the csv.Writer.

  1. package main
  3. import (
  4. 	"encoding/csv"
  5. 	"fmt"
  6. 	"os"
  7. 	"strconv"
  8. 	"sync"
  9. )
  11. type csvWriter struct {
  12. 	w *csv.Writer
  13. 	m sync.Mutex
  14. }
  16. func (c *csvWriter) write(rec []string) error {
  17. 	c.m.Lock()
  18. 	defer c.m.Unlock()
  19. 	return c.w.Write(rec)
  20. }
  22. func (c *csvWriter) flush() {
  23. 	c.m.Lock()
  24. 	defer c.m.Unlock()
  25. 	c.w.Flush()
  26. }
  28. func main() {
  29. 	outfile := "file.tsv"
  30. 	f, err := os.Create(outfile)
  31. 	if err != nil {
  32. 		fmt.Println(err)
  33. 		os.Exit(1)
  34. 	}
  35. 	defer f.Close()
  36. 	w := csvWriter{w: csv.NewWriter(f)}
  37. 	defer w.flush()
  38. 	w.w.Comma = '\t'
  40. 	a := []string{"a", "b"}
  41. 	i, j := 0, 1
  42. 	x := float64(2.7)
  44. 	// Write row.
  45. 	err = w.write(
  46. 		[]string{
  47. 			a[i], a[j],
  48. 			strconv.FormatFloat(x, 'f', 4, 64),
  49. 		},
  50. 	)
  51. 	if err != nil {
  52. 		fmt.Println(err)
  53. 	}
  54. }

答案3

得分: 2

选择一个现有的包可以简化你的代码，同时增加代码的可维护性。尝试使用go-pretty包。

  1. +---------------------------------------------------------------------+
  2. | Game of Thrones                                                     +
  3. +-----+------------+-----------+--------+-----------------------------+
  4. |   # | FIRST NAME | LAST NAME | SALARY |                             |
  5. +-----+------------+-----------+--------+-----------------------------+
  6. |   1 | Arya       | Stark     |   3000 |                             |
  7. |  20 | Jon        | Snow      |   2000 | You know nothing, Jon Snow! |
  8. | 300 | Tyrion     | Lannister |   5000 |                             |
  9. +-----+------------+-----------+--------+-----------------------------+
  10. |     |            | TOTAL     |  10000 |                             |
  11. +-----+------------+-----------+--------+-----------------------------+
英文:

choose a exist package can simple your code and also increase code maintainability。try go-pretty

  1. +---------------------------------------------------------------------+
  2. | Game of Thrones                                                     +
  3. +-----+------------+-----------+--------+-----------------------------+
  4. |   # | FIRST NAME | LAST NAME | SALARY |                             |
  5. +-----+------------+-----------+--------+-----------------------------+
  6. |   1 | Arya       | Stark     |   3000 |                             |
  7. |  20 | Jon        | Snow      |   2000 | You know nothing, Jon Snow! |
  8. | 300 | Tyrion     | Lannister |   5000 |                             |
  9. +-----+------------+-----------+--------+-----------------------------+
  10. |     |            | TOTAL     |  10000 |                             |
  11. +-----+------------+-----------+--------+-----------------------------+

huangapple
  • 本文由 发表于 2016年3月19日 20:09:01
  • 转载请务必保留本文链接：https://go.coder-hub.com/36101534.html
  • file
  • go
  • printing
匿名

发表评论

匿名网友

:?: :razz: :sad: :evil: :!: :smile: :oops: :grin: :eek: :shock: :???: :cool: :lol: :mad: :twisted: :roll: :wink: :idea: :arrow: :neutral: :cry: :mrgreen:

确定