结合Python多线程，和队列queue实现一个简单的队列消费者实例。用例批量检测ip是否存在。

from __future__ import print_function
import subprocess
import threading
from queue import Queue
from queue import Empty

def call_ping(ip):
    try:
        # subprocess.check_call检查命令是否执行正确
        subprocess.check_call(['ping',ip], stdout=subprocess.PIPE)
        print("{} is alive".format(ip))
    except subprocess.CalledProcessError as e:
        print("{} is unreachable.".format(ip))
        print(e.output)
        # print(e.returncode)

def is_reachable(q):
    try:
        while True:
            # q.get_nowait非阻塞从队列取出元素
            ip = q.get_nowait()
            call_ping(ip)
    except Empty:
        pass

def main():
    # 使用queue定义一个队列缓冲区，避免频繁的上下文切换
    q = Queue()
    with open('ip.txt', 'r', encoding='utf-8') as f:
        for line in f.readlines():
            # put添加元素
            q.put(line.strip('\n'))
    threads = []
    for i in range(2):
        thr = threading.Thread(target=is_reachable, args=[q,])
        thr.start()
        threads.append(thr)

    for thr in threads:
        thr.join()

if __name__ == '__main__':
    main()