Good choice !

you may see :

Introduction to Programming using Python

www.pasteur.fr/formation/infobio/python

www.pasteur.fr/formation/infobio/python/support.pdf

Good luck !

If you want something more "Bio" you have absolutely to deal with Biopython. It is absolutely fundamental for every biologist who want to approach python.

http://biopython.org/wiki/Documentation

http://biopython.org/DIST/docs/tutorial/Tutorial.html

Another issue very important (but not really basic) is the multiprocessing and multithreading to run the script faster:

https://docs.python.org/2/library/multiprocessing.html

http://www.tutorialspoint.com/python/python_multithreading.htm

for python.

http://www.tutorialspoint.com/python/python_tutorial.pdf

this resource is very good