用kill就可以了

os.system 的控制力很弱的，你需要 subprocess 模块的 .kill 方法来发送信号。

不过，只是 ping 的话，你干嘛不让它只 ping 10 次呢？你这是想干嘛啊？

[root@jenkins  xxxx]# time ping baidu.com -w 10s
PING baidu.com (220.181.57.217) 56(84) bytes of data.
64 bytes from 220.181.57.217 (220.181.57.217): icmp_seq=1 ttl=52 time=4.07 ms
64 bytes from 220.181.57.217 (220.181.57.217): icmp_seq=2 ttl=52 time=26.9 ms
64 bytes from 220.181.57.217 (220.181.57.217): icmp_seq=3 ttl=52 time=6.78 ms
64 bytes from 220.181.57.217 (220.181.57.217): icmp_seq=4 ttl=52 time=12.9 ms
64 bytes from 220.181.57.217 (220.181.57.217): icmp_seq=5 ttl=52 time=3.86 ms
64 bytes from 220.181.57.217 (220.181.57.217): icmp_seq=6 ttl=52 time=3.30 ms
64 bytes from 220.181.57.217 (220.181.57.217): icmp_seq=7 ttl=52 time=5.63 ms
64 bytes from 220.181.57.217 (220.181.57.217): icmp_seq=8 ttl=52 time=11.2 ms
64 bytes from 220.181.57.217 (220.181.57.217): icmp_seq=9 ttl=52 time=4.30 ms
64 bytes from 220.181.57.217 (220.181.57.217): icmp_seq=10 ttl=52 time=4.17 ms

--- baidu.com ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9013ms
rtt min/avg/max/mdev = 3.300/8.328/26.972/6.954 ms

real    0m10.006s
user    0m0.003s
sys    0m0.006s

不知道能不能满足你的需求

主要问题是执行的命令一直没有返回，os.system无法确定命令是否已经执行和执行成功
如果单纯的cmd命令 是否可以试试
os.system('start ping www.baidu.com -t')

注册signal.SIGINT信号

我试了一下，大概可以这样写：

import time

start = end = time.time()
def re(cmd):
    while (end - start) < 10:
        os.system(cmd);
        end = time.time()