UnicodeDecodeError issue

[Ferrous Cranus]

Here is the code inside files.py:

try:
	gi = pygeoip.GeoIP('/usr/local/share/GeoIPCity.dat')
	city = gi.time_zone_by_addr( os.environ['REMOTE_ADDR'] ) or 
gi.time_zone_by_addr( os.environ['HTTP_CF_CONNECTING_IP'] )
	host = socket.gethostbyaddr( os.environ['REMOTE_ADDR'] ) or 
socket.gethostbyaddr( os.environ['HTTP_CF_CONNECTING_IP'] ) or 
os.environ['REMOTE_ADDR']
except Exception as e:
	print( repr(e), file=open( '/tmp/err.out', 'w' ) )


that produces this:


[Sat Aug 31 08:29:33 2013] [error] [client 108.162.229.116] ValueError: 
underlying buffer has been detached, referer: http://superhost.gr/
[Sat Aug 31 08:29:33 2013] [error] [client 108.162.229.116] , referer: 
http://superhost.gr/
[Sat Aug 31 08:29:33 2013] [error] [client 108.162.229.116] Original 
exception was:, referer: http://superhost.gr/
[Sat Aug 31 08:29:33 2013] [error] [client 108.162.229.116] Traceback 
(most recent call last):, referer: http://superhost.gr/
[Sat Aug 31 08:29:33 2013] [error] [client 108.162.229.116]   File 
"/home/nikos/public_html/cgi-bin/files.py", line 135, in <module>, 
referer: http://superhost.gr/
[Sat Aug 31 08:29:33 2013] [error] [client 108.162.229.116] 
cur.execute('''INSERT INTO files (url, host, city, lastvisit) VALUES 
(%s, %s, %s, %s)''', (filename, host, city, lastvisit) ), referer: 
http://superhost.gr/
[Sat Aug 31 08:29:33 2013] [error] [client 108.162.229.116] NameError: 
name 'host' is not defined, referer: http://superhost.gr/


But 'host' defaults to an ip address if it cannot resolve the hostname.
Why the errro says its undefined?