Python中的子进程是什么

#!/usr/bin/env python

# coding=utf-8

import subprocess

print("$ nslookup www.yangcongchufang.com")

r = subprocess.call(['nslookup', 'www.yangcongchufang.com'])

print("Exit code: ", r)

➜ python subcall.py

$ nslookup www.yangcongchufang.com

Server:     219.141.136.10

Address:    219.141.136.10#53

Non-authoritative answer:

Name:   www.yangcongchufang.com

Address: 103.245.222.133

('Exit code: ', 0)

#!/usr/bin/env python

# coding=utf-8

import subprocess

print("$ nslookup")

p = subprocess.Popen(['nslookup'], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)

output, err = p.communicate(b"set q=mx\nyangcongchufang.com\nexit\n")

print(output.decode("utf-8"))

print("Exit code:", p.returncode)

set q=mx

yangcongchufang.com

exit