dongtaochan0777
2017-01-01 12:09
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在Golang中运行外部python，捕获连续的exec.Command Stdout

So my go script will call an external python like this

cmd = exec.Command("python","game.py")
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
go func(){
    err := cmd.Run()
    if err != nil{
    panic(err)
    }
}()

It runs my python script concurrently which is awesome. But now the problem is, my python script will run infinitely and it will print out some information from time to time. I want to "catch" these Stdout and print them out on my golang terminal. How do I do it concurrently (without waiting my python script to exit)?

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所以我的go脚本将像这样调用外部python 

  cmd = exec.Command（“ python”，“ game.py”）
cmd.Stdout = os.Stdout 
cmd.Stderr = os.Stderr 
go func（）{
 err：= cmd.Run（）\  n if err！= nil {
 panic（err）
} 
}（）
   
 
 
它同时运行我的python脚本，真棒。
但是 现在的问题是，我的python脚本将无限运行，并且会不时输出一些信息。 我想“捕获”这些Stdout，并在我的golang终端上将它们打印出来。 我该如何同时执行（不等待我的python脚本退出）？
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1条回答 默认 最新

  • dt1888 2017-01-01 12:29
    最佳回答

    Use cmd.Start() and cmd.Wait() instead of cmd.Run().

    https://golang.org/pkg/os/exec/#Cmd.Run

    Run starts the specified command and waits for it to complete.

    Start starts the specified command but does not wait for it to complete.

    Wait waits for the command to exit. It must have been started by Start.

    And if you want to capture stdout/stderr concurrently, use cmd.StdoutPipe() / cmd.StderrPipe() and read it by bufio.NewScanner()

    package main

import (
    "bufio"
    "fmt"
    "io"
    "os/exec"
)

func main() {
    cmd := exec.Command("python", "game.py")
    stdout, err := cmd.StdoutPipe()
    if err != nil {
        panic(err)
    }
    stderr, err := cmd.StderrPipe()
    if err != nil {
        panic(err)
    }
    err = cmd.Start()
    if err != nil {
        panic(err)
    }

    go copyOutput(stdout)
    go copyOutput(stderr)
    cmd.Wait()
}

func copyOutput(r io.Reader) {
    scanner := bufio.NewScanner(r)
    for scanner.Scan() {
        fmt.Println(scanner.Text())
    }
}

    The following is a sample python code for reproducing real-time output. The stdout may be buffered in Python. Explicit flush may be required.

    import time
import sys

while True:
    print "Hello"
    sys.stdout.flush()
    time.sleep(1)
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