help newbie asking for help to contribute

[k r <kuda rcity gmail com>]

hi there
i am a hobbyist python programmer i have done some visual basic in
couple of years ago and then switch to python but this was not a real
world experience so after search i decide that it will be good to
contribute in open source, first because i like the idea of open
source second to gain more experience in programming in general and in
game programming specifically so i take a copy of the gnome-Sudoku
source code in order to look in it but after a while i realize that
the source code of this game is much bigger than i thought it has
hundred of lines of code and i was very disappointing i thought it
will be easy for me to contribute in such a thing like the
gnome-Sudoku but after a while i realize that it need more experience
in programming with python and maybe in software engineering than what
i had so i email you hopping that i can find solution to my problem i
want to contribute in open source very bad but i didn't know where to
start coding from my experience in python is from books and a udacity
course in search engine programming with python not a real world
practice i know that coding for large program like gnome is not so
easy for the less experiences one's like me but isn't the hole idea of
open source is about contributing so if you can give me some small
operation like building some function or module that will put me in
the first step in order to have more knowledge in open source
programming will be much of helping for now  ...
Thank you