Handling 3 operands in an expression without raising an exception

[Νίκος]

Στις 29/9/2013 12:50 μμ, ο/η Dave Angel έγραψε:
> 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:
> 	gi,city,host=globals().get("gi", "who knows"), globals().get("city",
> "Άγνωστη Πόλη"), globals().get("host", "Άγνωστη
> Προέλευση")

Hello Dave,

By looking at your code i think that you are tellign the progrma to try 
to gri don't know what the function globals() is supposed to do

but i was thinking more of:

ipval = ( os.environ.get('HTTP_CF_CONNECTING_IP') or
os.environ.get('REMOTE_ADDR', "Cannot Resolve") )
try:
	city = gi.time_zone_by_addr( ipval )
	host = socket.gethostbyaddr( ipval ) [0]
except socket.gaierror as e:
	# We need something here to identify which one of the 2 above variables 
or even both of them went wrong, and then assign the appropriate value 
to each one of them but i don't know how to write it.

Is there a function that can tell us which variable failed to be 
assigned a value that we can use in order to decide to which string we 
weill be defaulting to?