for循环的行为出现了意外的结果。

huangapple
go评论128阅读模式
英文:

Unexpected behavior from for loop

问题

我希望这是一个简单的问题。当我从一个for循环内部的if语句中获取信息时，它不会传递到for循环外部。我可以正常地从if语句中打印信息，但之后就会丢失。我是不是漏掉了什么？作为一个来自Python的人，我以前从未遇到过这种情况。

  1. func main() {
  2.     var neededinfo string
  3.     for _, slice := range info_slices {
  4.         // 从slice中获取信息
  5.         if strings.Contains(slice, "indicator") {
  6.             neededinfo := string(ExeSH("echo '" + slice + "' | awk '{ print $4 }'"))
  7.             neededinfo = neededinfo[1:len(neededinfo)-2]
  8.             fmt.Println(neededinfo) // 返回我的信息
  9.         }
  10.     }
  11.     fmt.Println(neededinfo) // 什么都不返回
  12. }
英文:

I sure hope this is something simple. When I grab information from within an if statement that is inside of a for loop it is not carried to outside of the for loop. I can print the information from within the if statement just fine and then lose it afterwards. Am I missing something? Coming from Python I have never experienced this before.

  1. func main() {
  2.     var neededinfo string
  3.     for _, slice := range info_slices {
  4.         // Get information out of slices
  5.         if strings.Contains(slice, "indicator ") {
  6.             neededinfo := string(ExeSH("echo '" + slice + "' | awk '{ print $4 }'"))
  7.             neededinfo = neededinfo[1:len(neededinfo)-2]
  8.             fmt.Println(neededinfo) // Returns my information
  9.         }
  10.     }
  11.     fmt.Println(neededinfo) // Returns nothing
  12. }

答案1

得分: 2

最有可能的情况是你正在覆盖 neededinfo 变量。

  1. func main() {
  2.     var neededinfo []string
  3.     for _, slice := range info_slices {
  4.         // 从切片中获取信息
  5.         if strings.Contains(slice, "indicator ") {
  6.             response := string(ExeSH("echo '" + slice + "' | awk '{ print $4 }'"))
  7.             neededinfo = append(neededinfo, response[1:len(response)-2])
  8.         }
  9.     }
  10.     fmt.Println(neededinfo) 
  11. }

请注意，这只是代码的翻译，我无法提供关于代码的任何解释或建议。

英文:

Most likely is the fact that you are overwriting the neededinfo variable

  1. func main() {
  2.     var neededinfo []string
  3.     for _, slice := range info_slices {
  4.         // Get information out of slices
  5.         if strings.Contains(slice, "indicator ") {
  6.             response := string(ExeSH("echo '" + slice + "' | awk '{ print $4 }'"))
  7.             neededinfo = append(neededinfo, response[1:len(response)-2]
  8.         }
  9.     }
  10.     fmt.Println(neededinfo) 
  11. }

huangapple
  • 本文由 发表于 2014年7月10日 07:47:33
  • 转载请务必保留本文链接：https://go.coder-hub.com/24665430.html
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