python 学习过程中写的一些demo,Python学习的过程中主要参考了以下资料
http://www.practicepython.org/ http://www.pythonforbeginners.com/code-snippets-source-code/python-code-examples https://www.w3resource.com/python-exercises/ https://knightlab.northwestern.edu/2014/06/05/five-mini-programming-projects-for-the-python-beginner/ https://www.quora.com/Where-can-I-find-sample-projects-to-practice-Python https://github.com/zhiwehu/Python-programming-exercises/blob/master/100%2B%20Python%20challenging%20programming%20exercises.txt