Handling 3 operands in an expression without raising an exception

[Νίκος]

Στις 27/9/2013 3:17 μμ, ο/η Dave Angel έγραψε:
> On 27/9/2013 07:15, Νίκος wrote:
>
>> Στις 27/9/2013 1:43 μμ, ο/η Dave Angel έγραψε:
>
>     <snip>
>>
>>> ipval = ( os.environ.get('HTTP_CF_CONNECTING_IP') or
>>> os.environ.get('REMOTE_ADDR', "Cannot Resolve") )
>>> city = "Άγνωστη Πόλη"
>>> host = "Άγνωστη Προέλευση"
>>> try:
>>> 	city = gi.time_zone_by_addr( ipval )
>>> 	host = socket.gethostbyaddr( ipval ) [0]
>>> except socket.gaierror as e:
>>> 	pass
>>
>> Thanks for taking the time to expain this:
>>
>> In the exact above solution of yours opposed to the top of mines is that
>
> No idea what you mean here.  I'll assume you're talking about the
> version you DON'T quote here, the one with the if statements in the
> except clause.
>
>> you code has the benefit of actually identifying the variable that
>> failed to have been assigned a value while in my code no matter what
>> variable failes in the try block i assign string to both 'city' and
>> 'host' hence i dont really know which one of them is failing?
>
> Yes, it has that advantage. Of course it doesn't USE that advantage for
> anything so I'd go back to the pass version quoted immediately above.
> Or I'd have two separate try/except clauses, one for each function call.
>   After all, the implication of the failure is different for each.
>
>
>>
>> Di i understood it correctly?
>
> I think so.
>

Thank you for everything, i appreciate your time and effort to help me 
understand.