The Python User Group Austria sometimes holds python quizes. Code from these challenges is free for all.
For a list of challenges issued see http://pyug.at/PythonQuiz/
kalaha - http://pyug.at/PythonQuiz/2012-05/
A half-done implementation of the board game Kalaha. The rules, game logic and output is completed but the user interface is missing.
Various implementations of number formatting. Includes my first attempts at code golfing and a web app
mastermind_cheater - http://pyug.at/PythonQuiz/2016-03
A (cheating) solver for the cows&bulls game we programmed in our dojo.