000-- Euclidean algorithm
running result:
001-- Decimal to Bin:
Running result:
002-- DRY principle : Don‘t Repeat Yourself
003-- using a tupel as a parameter for a function is not applicable. But we still can make it.
004-- a funtion to calculate x^y
hausaufgabe--python 17- Function definition
原文：http://www.cnblogs.com/Shareishappy/p/6974154.html