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From: "Gisle Vanem" <gvanem@yahoo.no>
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Subject: Re: DNS query against a specific server.
Date: Mon, 30 Sep 2013 15:35:15 +0200
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Xref: csiph.com comp.lang.python:55074

"Chris Angelico" <rosuav@gmail.com> wrote:

> There are a few Python DNS modules. It means adding another
> dependency, but perhaps not as large as twisted. And of course, you
> could always manually send UDP packets and listen for responses, but
> that seems a little unnecessary :)

Then there is pycares; "a Python module which provides an interface to 
c-ares.... c-ares is a C library that performs DNS requests and name resolves 
asynchronously.". I have good experience wih C-ares and it can set
specific nameservers. Ref:
  https://pypi.python.org/pypi/pycares/0.3.0

--gv