save project

diyyuan.py

 import turtle
 pen1=turtle.Pen()
+screen=turtle.Screen()
+screen.bgcolor("yellow")
 pen1.pensize(10)
 pen1.pencolor("black")
+# pen1.penup()
+# pen1.goto(-100,0)
+# pen1.write("..",font=("",30,""))
+len=50
 pen1.left(45)
-pen1.forward(100)
-pen1.circle(50,180)
+pen1.forward(len)
+pen1.circle(len/2,180)
 pen1.right(90)
-pen1.circle(50,180)
-pen1.forward(100)
+pen1.circle(len/2,180)
+pen1.forward(len)
 pen1.hideturtle()
 turtle.done()