How to add a current string into an already existing list

[Nick the Gr33k]

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.

I dont know why it copmains about:
TypeError: 'NoneType' object is not iterable

what object is supposed to have benn of None type?
how do i check for it?