本人小白 画图代码运行后出现图中现象，求大神指教！！！非常感谢！！

import turtle
def drawSnake(rad,abgle,len,neckrad):
for i in range(len):
turtle.circle(rad,angle)
turtle.circle(-rad,angle)
turtle.circle(rad,angle/2)
turtle.fd(rad)
turtle.circle(neckrad+1,180)
turtle.fd(rad*2/3)

def main():
turtle.setup(1300,800,0,0)
pythonsize=30
turtle.penssize(pythonsize)
turtle.pencolor("red")
turtle.seth(-40)
drawSnake(40,80,5,pythonsize/2)

main()
turtle.done()

修改后的代码可以成功运行出来图像：

import turtle

def drawSnake(rad, angle, length, neckrad):
    for i in range(length):
        turtle.circle(rad, angle)
        turtle.circle(-rad, angle)
        turtle.circle(rad, angle/2)
        turtle.forward(rad)
        turtle.circle(neckrad+1, 180)
        turtle.forward(rad*2/3)

def main():
    turtle.setup(1300, 800, 0, 0)
    pythonsize = 30
    turtle.pensize(pythonsize)
    turtle.pencolor("red")
    turtle.setheading(-40)
    drawSnake(40, 80, 5, pythonsize/2)

main()
turtle.done()

```