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Re: Subprocess puzzle and two questions

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On Nov 14, 2012, at 9:22 AM, Roy Smith <roy@panix.com> wrote:

> In article <mailman.3666.1352873042.27098.python-list@python.org>,
> William Ray Wing <wrw@mac.com> wrote:
> 
>> On Nov 13, 2012, at 11:41 PM, Roy Smith <roy@panix.com> wrote:
>> 
>>> In article <mailman.3664.1352867713.27098.python-list@python.org>,
>>> wrw@mac.com wrote:
>>> 
>>>> I need to time the operation of a command-line utility (specifically 
>>>> nslookup) from within a python program I'm writing.
>>> 
>>> Ugh.  Why are you doing this?  Shelling out to nslookup is an incredibly 
>>> slow and clumsy way of doing name translation.  What you really want to 
>>> be doing is calling getaddrinfo() directly.
>>> 
>>> See http://docs.python.org/2/library/socket.html#socket.getaddrinfo for 
>>> details.
>>> -- 
>> Because, unless I'm badly mistaken (very possible), getaddrinfo doesn't let 
>> me specify the server from which the name is returned. I'm really not after 
>> the name, what I'm REALLY after is the fact that a path exists to the name 
>> server I specify (and how long it takes to respond). In the "good old days" I 
>> would just have ping'd it, but these days more and more DNS boxes (and 
>> servers of all sorts) are shutting off their ping response.
>> 
>> Thanks, Bill
> 
> Oh, my.  You're using DNS as a replacement for ping?  Fair enough.  In 
> that case, all you really care about is that you can connect to port 53 
> on the server...
> 
> import socket
> import time
> s = socket.socket()
> t0 = time.time()
> s.connect(('8.8.8.8', 53))
> t1 = time.time()
> print "it took %f seconds to connect" % (t1 - t0)
> -- 
> http://mail.python.org/mailman/listinfo/python-list

Now THAT looks better.  Simpler, cleaner, (longer, taller, stronger, faster, cheaper…  :-)

Thanks,
Bill

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Subprocess puzzle and two questions wrw@mac.com - 2012-11-13 22:34 -0500
  Re: Subprocess puzzle and two questions Roy Smith <roy@panix.com> - 2012-11-13 23:41 -0500
    Re: Subprocess puzzle and two questions William Ray Wing <wrw@mac.com> - 2012-11-14 00:03 -0500
      Re: Subprocess puzzle and two questions Roy Smith <roy@panix.com> - 2012-11-14 09:22 -0500
        Re: Subprocess puzzle and two questions Chris Angelico <rosuav@gmail.com> - 2012-11-15 01:40 +1100
          Re: Subprocess puzzle and two questions roy@panix.com (Roy Smith) - 2012-11-14 11:20 -0500
            Re: Subprocess puzzle and two questions Chris Angelico <rosuav@gmail.com> - 2012-11-15 08:54 +1100
              Re: Subprocess puzzle and two questions Roy Smith <roy@panix.com> - 2012-11-14 20:49 -0500
                Re: Subprocess puzzle and two questions Chris Angelico <rosuav@gmail.com> - 2012-11-15 13:04 +1100
                Re: Subprocess puzzle and two questions Roy Smith <roy@panix.com> - 2012-11-14 21:10 -0500
                Re: Subprocess puzzle and two questions Chris Angelico <rosuav@gmail.com> - 2012-11-15 13:21 +1100
                Re: Subprocess puzzle and two questions Dave Angel <d@davea.name> - 2012-11-14 21:55 -0500
                Re: Subprocess puzzle and two questions Kushal Kumaran <kushal.kumaran+python@gmail.com> - 2012-11-15 10:23 +0530
                Re: Subprocess puzzle and two questions Nobody <nobody@nowhere.com> - 2012-11-15 22:54 +0000
                Re: Subprocess puzzle and two questions Roy Smith <roy@panix.com> - 2012-11-15 20:07 -0500
                Re: Subprocess puzzle and two questions Nobody <nobody@nowhere.com> - 2012-11-17 00:17 +0000
              DNS from Python (was Re: Subprocess puzzle and two questions) aahz@pythoncraft.com (Aahz) - 2012-11-14 21:42 -0800
        Re: Subprocess puzzle and two questions wrw@mac.com - 2012-11-14 09:37 -0500
  Re: Subprocess puzzle and two questions Tim Roberts <timr@probo.com> - 2012-11-13 23:17 -0800

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