How to add a current string into an already existing list

[Nick the Gr33k]

Στις 5/11/2013 1:16 μμ, ο/η Dave Angel έγραψε:
> On Tue, 05 Nov 2013 12:33:49 +0200, Nick the Gr33k
> <nikos.gr33k at gmail.com> wrote:
>> Στις 5/11/2013 12:20 μμ, ο/η Antoon Pardon έγραψε:
>> > Did you read the documentation of fetchone?
>
>
>
>
>> fetchone is like fetchall except from the fact that the former
> returned
>> a row of data while the latter returned a list of rows of data.
>
> That's not the only difference. See the word None there in one of the
> descriptions?
>
>> TypeError: 'NoneType' object is not iterable
>
> Examine the statement it's complaining about. It's obvious which item
> it's trying to iterate over.
>


-- 

So perhaps 'data' coudlnt retrive any values from the database that why 
it cannot unpack them to the 3 variables?

if so i altered the code to:

		# fetch those columns that act as lists but are stored as strings
		cur.execute('''SELECT refs, visits, downloads FROM visitors WHERE 
counterID = %s and host = %s''', (cID, host) )
		data = cur.fetchone()

		ref = visit = download = []
		if cur.rowcount:
			# unpack data into variables
			(ref, visit, download) = data
		
			# retrieve long strings and convert them into lists respectively
			refs = ref.split()
			visits = visit.split()
			downloads = download.split()
		else:
			# initiate these values
			ref = ref
			visit = lastvisit
			download = ''
		
		# add current strings to each list respectively
		refs.append( ref )
		visits.append( visit )
		downloads.append( download )
		
		# convert lists back to longstrings
		refs = ', '.join( refs )
		visits = ', '.join( visits )
		downloads = ', '.join( downloads )

		# save this visit as an entry into database
		cur.execute('''INSERT INTO visitors (counterID, refs, host, city, 
useros, browser, visits, hits = hits + 1, downloads) VALUES (%s, %s, %s, 
%s, %s, %s, %s, %s, %s)''',
						(cID, refs, host, city, useros, browser, visits, hits, downloads) )
=======================

but this also fail to run :( :( :(