在 subprocess.call() 中将列表索引作为参数传递

Question

I'm not sure what's wrong here. I'm getting 0 0 0 0 as a output.

#!/usr/bin/env python3

import subprocess

fourletterwords = ["srvr", "stat", "mntr"]

for fourlw in fourletterwords:

    output = subprocess.call("echo {fourlw} | nc localhost 2181", shell=True)

    print (output)

Answer 1

The return value of subprocess.call() is the the return code, ie the exit status, of the call, not the output. Try using subprocess.check_output() instead:

output = subprocess.check_output(f"echo {fourlw} | nc localhost 2181", shell=True)

See the docs here