Hi, I want to start learning Python. All kind of tutorial-websites ask me wether I want to learn Python 2.7 or Python 3.3. So which Version I have to learn, if I want to use Python in Blender?
For Blender, learn 3.3
Ok, thank you 
Always learn the latest. But its not that big of a deal going from 2.7 to 3.3. Or really even going from python to C++. All object oriented languages are related. But the newest versions of the languages are sometimes organized a little differently.