gistfile1.txt

$ cat mi-driver.py 
from builtins import bytes

import subprocess
import sys
from subprocess import Popen
from subprocess import PIPE


def sendCmd(process, command):
    command += "\n"
    by_str = bytes(command, 'utf-8')
    process.stdin.write(by_str)
    process.stdin.flush()

def readOutputLine(process):
    byte_str = process.stdout.readline()
    return byte_str.decode("utf-8").strip("\n")

def spawnMI(mi_path):
    args = [mi_path]
    return Popen(args, stdout=PIPE, stdin=PIPE, stderr=PIPE)

def compare(expected, actual):
    if expected == actual:
        return
    print("Mismatch in reply!")
    print("Expected: " + expected)
    print("Actual: " + actual)

def main():
    mi_path = "/Users/davide/work/llvm-project-20170507/build-py/bin/lldb-mi"
    proc = spawnMI(mi_path)
    reply = readOutputLine(proc)
    print(reply)

    sendCmd(proc, "-unknown-command")
    reply = readOutputLine(proc)
    print(reply)
        
    return

if __name__ == "__main__":
    main()