Handling 3 operands in an expression without raising an exception

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Στις 29/9/2013 2:04 πμ, ο/η Chris Angelico έγραψε:
> On Sun, Sep 29, 2013 at 4:45 AM, Mark Lawrence <breamoreboy at yahoo.co.uk> wrote:
>> Not tortured, simply murdered so we don't have to put up with his completely
>> unacceptable behaviour, which sadly is thriving owing to so many people
>> ignoring the "do not feed this moron" signs.
>
> You miss one important factor in these discussions: the silent
> majority of readers. We have a few people here who are not "worth"
> responding to, as they're highly unlikely to listen (the most
> noteworthy other example being jmf on Unicode), but that doesn't mean
> the threads can't be useful to someone else. And sometimes there can
> be some extremely entertaining conversation, too.
>
> That's also why I don't plonk anyone :)

Its not that i don't listen, its that i want something to be implemented 
in a specific way.

ipval = ( os.environ.get('HTTP_CF_CONNECTING_IP') or 
os.environ.get('REMOTE_ADDR', "Cannot Resolve") )

try:
	gi = pygeoip.GeoIP('/usr/local/share/GeoIPCity.dat')
	city = gi.time_zone_by_addr( ipval )
	host = socket.gethostbyaddr( ipval ) [0]
except socket.gaierror as e:
	city = "Άγνωστη Πόλη"
	host = "Άγνωστη Προέλευση"

My question was if the above code, in the except clause, can be written 
in 1-line while identifying which one of the two variables have failed 
to be assigned a value in the try: clause and assign to it respectively.

And i don't mean like this:

if not city:
	city ="blabla"
if not host:
	host="blablabla"


Can thes be witten without and if perhaps with the use of 'or' operator 
in 1-line within the except clause?