python并发扫描存活主机

import subprocess
import os
import time
 
def ping(host):
    rc=subprocess.call('ping -c2 %s &> /dev/null' % host,shell=True)
    if rc == 0:
        print('%s:up'% host)
    else:
        print('%s:down'% host)
if __name__ == '__main__':
    ips=['176.130.10.%s' % i for i in range(1,255)]
    for i in ips:
        pid=os.fork()
        if pid==0:
            ping(i)
            exit(0)