save project

pen.py

@@ -4,12 +4,13 @@ screen=turtle.Screen()
 screen.bgcolor("blue")
 pen.pensize(10)
 pen.pencolor("red")
+len=100
 pen.left(45)
-pen.forward(100)
-pen.circle(50,180)
+pen.forward(2*len)
+pen.circle(len,180)
 pen.right(90)
-pen.circle(50,180)
-pen.forward(100)
+pen.circle(len,180)
+pen.forward(2*len)
 pen.penup()
 pen.goto(100,-100)
 pen.write("生日快乐",font=("Times",30,"normal"))