Laziness is a virtue - well, in programming anyway! Professor Thorsten Altenkirch on how you can use the 'yield' to compute certain things "on demand" To Infinity & Beyond: https://www.youtube.com/watch?v=bnRNiE_OVWA Python Sudoku Solver: https://www.youtube.com/watch?v=G_UYXzGuqvM https://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: https://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com/