Here are a few links to some tutorials/documentation and challenges to get you up and running using python.
I personally think that the above link is a brilliant and thorough tutorial.
They say the best way to do is by doing, thus here are some awesome sites for programming puzzles, if you use the documentation and what you've learned from the tutorial, you'll find them to be really interesting.
So, with a few links provided you should be able to start learning python straight away!
(and obviously you'll find a lot more with a google search, but I find these to be the best)
...if anyone has any other tutorial/books/programming puzzles they'd like me to add, just drop a post and ask
~ Craig`