Easy AI with Python

Eight Queens. Six lines: http://code.activestate.com/recipes/576647/

Alphametics solver: http://code.activestate.com/recipes/576615/

Data Mining with Neural Nets: http://code.activestate.com/recipes/496908/

Mastermind-style code-breaking: http://code.activestate.com/recipes/496907/

Sudoku Solver: http://code.activestate.com/recipes/473893/