Your command ping 10.9.88.69 will not stop in the Linux environment,
And subprocess.Popen defaults to waiting for the command to end before returning the result, which is blocking

It can be like this

1. Let the ping end early. Add multiple parameters -c to specify the number of pings

cmd='ping 10.9.88.69 -c 3'
P=subpross.Popen(cmd,stdin=subprocess.PIPE,stdout=subprocess.PIPE,stderr=subprocess.PIPE,shell=True)
reshult=p.stdout.read()

2. Change blocking to non-blocking

import os
import time
import fcntl
import subprocess

cmd = 'ping 10.9.88.69'

p = subprocess.Popen(cmd,
                     stdin=subprocess.PIPE,
                     stdout=subprocess.PIPE,
                     stderr=subprocess.PIPE,shell=True)

fd = p.stdout.fileno()
fl = fcntl.fcntl(fd, fcntl.F_GETFL)
fcntl.fcntl(fd, fcntl.F_SETFL, fl | os.O_NONBLOCK)

while True:
    try:
        line = p.stdout.readline()
        print(line)
    except:
        time.sleep(1)