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Groups > comp.lang.python > #18713

Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error

Date 2012-01-09 14:35 -0800
From Dominic Binks <dbinks@codeaurora.org>
Subject Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error
References (2 earlier) <bacea15d-fae0-4b1f-8a8e-a8b06b561fc0@t30g2000vbx.googlegroups.com> <roy-F4BA5C.13424802012012@news.panix.com> <24123dfe-b2fc-4f4c-8dfe-23bfef19b205@m10g2000vbc.googlegroups.com> <roy-4CE54B.15314102012012@news.panix.com> <f683b8f4-3a59-4c9f-94ef-82a9017dcd31@m20g2000vbf.googlegroups.com>
Newsgroups comp.lang.python
Message-ID <mailman.4552.1326148616.27778.python-list@python.org> (permalink)

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On 1/9/2012 2:19 PM, Νικόλαος Κούρας wrote:
> Can you please explain me what the [0] in host =
> socket.gethostbyaddr( os.environ['REMOTE_ADDR'] )[0] does at the end?
>
> Why not just host = socket.gethostbyaddr( os.environ['REMOTE_ADDR'] )
> instead? what is the need of [0] ?

The address database can have multiple names for the same IP address so 
gethostbyaddr returns a list - [0] being the first item in the list (and 
usually considered the canonical name)

-- 
Dominic Binks: dbinks@codeaurora.org
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum

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Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2012-01-02 16:49 +0100
  Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error Νικόλαος Κούρας <nikos.kouras@gmail.com> - 2012-01-02 10:18 -0800
    Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error Roy Smith <roy@panix.com> - 2012-01-02 13:42 -0500
      Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error Νικόλαος Κούρας <nikos.kouras@gmail.com> - 2012-01-02 11:51 -0800
        Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error Roy Smith <roy@panix.com> - 2012-01-02 15:31 -0500
          Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error Νικόλαος Κούρας <nikos.kouras@gmail.com> - 2012-01-09 14:19 -0800
            Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error Dominic Binks <dbinks@codeaurora.org> - 2012-01-09 14:35 -0800
              Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error Νικόλαος Κούρας <nikos.kouras@gmail.com> - 2012-01-09 15:04 -0800
              Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2012-01-10 07:42 +0100
                Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error Chris Angelico <rosuav@gmail.com> - 2012-01-10 18:29 +1100
            Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error Chris Angelico <rosuav@gmail.com> - 2012-01-10 10:14 +1100
            Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error Nick Dokos <nicholas.dokos@hp.com> - 2012-01-09 18:32 -0500
            Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error Chris Angelico <rosuav@gmail.com> - 2012-01-10 13:08 +1100
      Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error Νικόλαος Κούρας <nikos.kouras@gmail.com> - 2012-01-02 11:54 -0800

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