Go子进程通信

Question

GO:有没有办法与等待stdin输入的子进程(shell脚本/ python脚本)进行通信？

例如python脚本(子进程)

import sys
while True:
    sys.stdout.write('%s\n'%eval(sys.stdin.readline()))

在go程序中，我希望创建这个python脚本的子进程，并在必要和反复的情况下在stdin上提供它的输入，并获取它的输出。在Go程序的标准输出上写入或从文件中读取/写入也可以。

这大概是我想做的，但什么都没发生-

c := exec.Command("python", "-u add.py")
si,_ := c.StdinPipe()
so,_ := c.StdoutPipe()    
c.Start()
si.Write([]byte("2+2\n")

Answer 1

下面是go代码的工作版本(python代码不变)。

注意:检查所有错误，固定-u标志，使用布菲奥读取一行，等等待进程结束。

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

func main() {
    c := exec.Command("python", "-u", "add.py")
    si, err := c.StdinPipe()
    if err != nil {
        log.Fatal(err)
    }

    so, err := c.StdoutPipe()
    if err != nil {
        log.Fatal(err)
    }
    reader := bufio.NewReader(so)

    err = c.Start()
    if err != nil {
        log.Fatal(err)
    }

    // Now do some maths
    for i := 0; i < 10; i++ {
        sum := fmt.Sprintf("2+%d\n", i)
        _, err = si.Write([]byte(sum))
        if err != nil {
            log.Fatal(err)
        }
        answer, err := reader.ReadString('\n')
        if err != nil {
            log.Fatal(err)
        }
        fmt.Printf("Answer to %q is %q\n", sum, answer)
    }

    // Close the input and wait for exit
    si.Close()
    so.Close()
    c.Wait()
}

产

Answer to "2+0\n" is "2\n"
Answer to "2+1\n" is "3\n"
Answer to "2+2\n" is "4\n"
Answer to "2+3\n" is "5\n"
Answer to "2+4\n" is "6\n"
Answer to "2+5\n" is "7\n"
Answer to "2+6\n" is "8\n"
Answer to "2+7\n" is "9\n"
Answer to "2+8\n" is "10\n"
Answer to "2+9\n" is "11\n"