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turtle.circle()函数
定义：turtle.circle(radius, extent=None)
作用：根据半径radius绘制extent角度的弧形
参数：
radius ：弧形半径
当radius值为正数时，圆心在当前位置/小海龟左侧。
当radius值为负数时，圆心在当前位置/小海龟右侧。
extent ：弧形角度。当无该参数或参数为None时，绘制整个圆形
当extent值为正数时，顺小海龟当前方向绘制。
当extent值为负数时，逆小海龟当前方向绘制。
上述内容，在将小海龟视作一个有向箭头后，可以按照如下方法助记。即：正正左顺，负负右逆，正负左逆，负正右顺。
在这个助记法中，正正、负负、正负、负正表示条件（即参数radius、extent取值情况），左顺、右逆、左逆、右顺表示结果（即以小海龟当前方向
作参照时的圆心位置及画笔绘制方向）。详述如下：
正正表示radius为正，extent正；负负表示radius为负，extent负；正负表示radius为正，extent负；负正表示radius为负，extent正。
左：表示圆心在小海龟左边；右：表示圆心在小海龟右边； 顺：表示顺小海龟当前方向绘制； 逆：表示逆小海龟当前方向绘制
下图是对上述陈述的形象总结。其中，绿色箭头表示有向的小海龟，红色箭头表示依据参数radius, extent取值的正负组合确定的绘制方向。
---------- 小海龟是有向的，可视作一个有向箭头 ----------
下图是对上图的另一种等价表达。
---------- 小海龟是有向的，可视作一个有向箭头 ----------
