• The (official) Python Tutorial (from Python.org)
  • For Python 2.x
  • For Python 3.x
• Learn Python the Hard Way by Zed Shaw
• Automate the Boring Stuff with Python
• Google Python Class
• Python for Informatics
• Dive into Python
• Python Standard Library by Example
• Django Girls Tutorial
• TDD with Python
• Django Web Framework (Python) - Learn web development | MDN

Tutorial websites where you can write (and test) code while reading

• Codecademy
• Hackerrank
• Learnpython

• What's new in Python 3.0 (official)
  • Read this link for an introduction of the key changes between Python 2.7 and 3.0 (the first in the 3.x series). Once you're done, do follow it up with the other "what's new" documents for the succeeding 3.x versions
• Porting Python 2 Code to Python 3 (official)
• The key differences between Python 2.7.x and Python 3.x with examples