turtle_drawing.py 文件源码

def draw_tree(h):
    if h == 0:
        return
    turtle.forward(LENGTH * h)
    turtle.left(ANGLE)
    draw_tree(h - 1)
    turtle.right(2 * ANGLE)
    draw_tree(h - 1)
    turtle.left(ANGLE)
    turtle.backward(LENGTH * h)