python – 进行子进程通信

GO：有没有办法与子进程( shell脚本/ python脚本)进行通信,它正在等待stdin上的输入？

例如python脚本(子进程)

import sys
while True:
    sys.stdout.write('%sn'%eval(sys.stdin.readline()))

在go程序中,我想创建这个python脚本的子进程,并在必要时重复地在其stdin上提供输入,并获取其输出.在Go程序的stdout上写或从文件读/写也可以.

这大致是我正在尝试的,但没有任何反应 –

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

解决方法

注意：检查所有错误,修复-u标志,使用bufio读取一行,并使用Wait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+%dn",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 %qn",sum,answer)
    }

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

哪个产生

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

（编辑：安卓应用网）

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