turtle

 1 import turtle
 2 turtle.shape("turtle")
 3 turtle.color("red")
 4 #默认向右
 5 turtle.left(90)
 6 turtle.forward(200)
 7 #离开屏幕
 8 turtle.up()
 9 turtle.right(90)
10 #向前走200
11 turtle.forward(200)
12 turtle.right(90)
13 turtle.forward(200)
14 #进入屏幕
15 turtle.down()
16 turtle.right(90)
17 turtle.forward(200)
18 turtle.begin_fill()
19 #画圆
20 turtle.circle(100)
21 turtle.end_fill()