#format wiki
#language en
{{{
#!/usr/bin/env python3
'''
    2017 - python3 script starting template.
    * Parse args
    * Subprocess
    * re regular expressions.
'''
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import re
import time
import subprocess
def ping(hosts=[ "8.8.8.8" ],debug=1):
    p = dict() # {} # ip -> process
    for n in hosts: # start ping processes
        ip = "%s" % n
        p[ip] = subprocess.Popen(['ping', '-q' , '-n', '-w5', '-c1', ip], stdout=subprocess.PIPE,stderr=subprocess.STDOUT,shell=False,)
        #NOTE: you could set stderr=subprocess.STDOUT to ignore stderr also
    if debug: 
      time.sleep(0.2)
      print("Start ping display ...")
    while p:
        time.sleep(0.2)  #Slowdown looping
        for ip, proc in p.items():
            if proc.poll() is not None: # ping finished
                del p[ip] # remove from the process list
                if proc.returncode == 0:
                    print('%s active' % ip)
                elif proc.returncode == 1:
                    print('%s no response' % ip)
                else:
                    print('%s error' % ip)
               
                # rtt min/avg/max/mdev = 22.293/22.293/22.293/0.000 ms
                out=proc.communicate()[0]
                if debug>2: print("out=",out)
                search = re.search(b'rtt min/avg/max/mdev = (.*)/(.*)/(.*)/(.*) ms',
                                   out, re.M|re.I)
                if search:
                  ping_rtt = search.group(2).decode('utf-8')
                  print( "OK " + str(ip) + " rtt= "+ ping_rtt )
                break

            #print("skip ")

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def pingOk(sHost):
    try:
        output = subprocess.check_output("ping -{} 1 {}".format('c', sHost), shell=True)

    except Exception as e:
        return False

    return True
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def run(debug=0):
   # with stderr=subprocess.STDOUT, stdout and stderr will be combined
   # run(..., check=True, stdout=PIPE).stdout
   stdout = subprocess.run(["ls", "-l", "/dev"], stdout=subprocess.PIPE).stdout
   if debug: print("debug: run: ",stdout)
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import argparse
def getArgs(debug=0):
    parser = argparse.ArgumentParser(description='Process some integers.')
    parser.add_argument('integers', metavar='N', type=int, nargs='+',
                   help='an integer for the accumulator')
    parser.add_argument('--sum', dest='accumulate', action='store_const',
                   const=sum, default=max,
                   help='sum the integers (default: find the max)')
    args = parser.parse_args()
    if debug: print("debug: args:",args.accumulate(args.integers))
    return args
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def main():
    args = getArgs(debug=0)
    print()
    print( pingOk("8.8.8.8") )
    #run(debug=1)
    ping(["8.8.8.8", "4.2.2.2.4.4" , "vigor.nz" , "3.5.7.9"])
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if __name__ == "__main__":
    # execute only if run as a script
    main()
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}}}
...