https://blog.csdn.net/u014041590/article/details/88913903
https://blog.csdn.net/Mrzhangjwei/article/details/59489702
https://blog.csdn.net/zengxiantao1994/article/details/76588580
这三个博客基本写的很全面了。
python的turtle库
原文：https://www.cnblogs.com/jdwfff/p/12000854.html
