龟图，一只乌龟在地上画图，用C++程序实现的涉及到面向对象的设计理念-Turtle graphics, a turtle to draw on the ground with the C++ program related to object-oriented design concepts

Turtle graphics demo for Python 3.

turtle库是非常适合初学者使用的简单图形绘制模块，本程序利用turtle库绘图帮助大家掌握turtle库使用(Turtle library is very suitable for beginners to use simple graphics rendering module. This program uses turtle library drawing to help you master the use of turtle library.)