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Date: Thu, 26 Sep 2013 12:12:23 +0200
From: Antoon Pardon <antoon.pardon@rece.vub.ac.be>
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To: python-list@python.org
Subject: Re: Handling 3 operands in an expression without raising an exception
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Xref: csiph.com comp.lang.python:54804

Op 26-09-13 11:56, Νίκος schreef:
> Στις 26/9/2013 11:55 πμ, ο/η Nobody έγραψε:
>> On Thu, 26 Sep 2013 10:26:48 +0300, Νίκος wrote:
>>
>>> How can i wrote the two following lines so for NOT to throw out
>>> KeyErrors when a key is missing?
>>>
>>> city = gi.time_zone_by_addr( os.environ['HTTP_CF_CONNECTING_IP'] ) or
>>> gi.time_zone_by_addr( os.environ['REMOTE_ADDR'] ) or
>>> "Άγνωστη Πόλη"
>>
>> tz = None
>> ip = os.environ.get('HTTP_CF_CONNECTING_IP')
>> if ip:
>>    tz = gi.time_zone_by_addr(ip)
>> if not tz:
>>    ip = os.environ.get('REMOTE_ADDR')
>>    if ip:
>>      tz = gi.time_zone_by_addr(ip)
>> if not tz:
>>    tz = "ÎγνÏÏÏη Î Ïλη"
>>
>> Likewise for the hostname.
>>
> 
> Its logic is simple and straightforward but too many lines:
> 
> host = socket.gethostbyaddr( os.environ.get('HTTP_CF_CONNECTING_IP') or
> os.environ.get('REMOTE_ADDR') or  "Άγνωστη Προέλευση" )
> 
> this is much better in my opinion and straighforward also and more clear
> to read:

No it is not and you prove that in the very next line.

> it doens't work though:

If it doesn't do what you think it should do then it is not straight
forward or clear, at least not to you.

-- 
Antoon Pardon