Learn Python On Ubuntu Linux FOR FREE

Dig the repository and you will be able to find some Python caddies. Like this package:

diveintopython

A Python tutorial written by Mark Pilgrim. There's even a Chinese version in the repository:

diveintopython-zh

If you are interested in GUI development, check this out:

python-gtk2-tutorial

Another tutorial on NumPy:

python-numeric-tutorial

What else? Keep digging!:)