Python

[EN]

Fajny cheat sheet:
http://archive.4chon.net/edu/49/src_1331141436081.png

Tutorial (Blog)
http://harkuchh.com/

Interactive
https://www.learnstreet.com/lessons/study/python
http://www.checkio.org/ (an in-browser game where you need to program things to progress along).
https://www.edx.org/course-search?search_query=python
http://www.codecademy.com/
https://www.udacity.com/courses#!/all

Books (free online books)
http://diveintopython.org/ (recommended highly)
http://learnpythonthehardway.org (recommended by the #python IRC group)
http://www.swaroopch.com/notes/Python (A Byte of Python)
http://inventwithpython.com/ (more python3 here than python2 - use with caution)
http://pythonbooks.revolunet.com/

Classes
http://code.google.com/edu/languages/google-python-class/ (googles free python course)
http://www.cse.msu.edu/~cse231/PracticeOfComputingUsingPython/ (compilation of python programming projects with guide)

Full documentation
http://python.org (seems reasonable)
http://www.python-course.eu/index.php (Basic, Advance, Tkinter, Books, and Python3 tutorial)
http://www.rexx.com/~dkuhlman/python_book_01.html (very thorough and detailed explanation about everything python).

Tutorial
http://www.pythonforbeginners.com/ (nice little pieces of code with comments and explanations on how to do fun stuff with python, like using the youtube API).
www.zetcode.com/lang/python/
http://www.sthurlow.com/python/

New programmers
http://wiki.python.org/moin/BeginnersGuide (a beginners guide from the above site)
http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-189-a-gentle-introduction-to-programming-using-python-january-iap-2011/lectures/ (A gentle introduction to programming using python, this is suitable for non-programmers or new programmers).

Specific to modules or frameworks
http://www.djangobook.com/en/2.0/ (Online book for learning Django Web Framework)
http://www.lightbird.net (Online tutorial for learning Python and Django)
http://www.dabeaz.com/pydata/ (learn python through fun public data hacking)
http://pymotw.com/2/contents.html (Python Module Of the Week is a tour of the standard library. Each module is explained with real-life examples).
http://rhodesmill.org/brandon/chapters/screen-scraping/ (web scraping with python)

Blogs
http://www.hdinfoworld.com/category/python/ (Blog containing bite-sized python concepts, non-linear learning)
http://impythonist.wordpress.com (Very active blog with thorough explanations and code examples for various tasks that you can do with python - network, language processing, android apps etc. -)

Videos
http://www.youtube.com/user/sentdex/videos (a good collection of videos from installing python to making financial analysis).