save project

diy1.py

 import turtle
-len=60
 a=turtle.Pen()
+c=turtle.Screen()
+n=c.textinput("提示","输入半径")
 a.fillcolor("red")
 a.begin_fill()
 a.left(45)
-a.forward(2*len)
-a.circle(len,180)
+a.forward(2*float(n))
+a.circle(float(n),180)
 a.right(90)
-a.circle(len,180)
-a.forward(2*len)
+a.circle(float(n),180)
+a.forward(2*float(n))
 a.end_fill()
 a.penup()
 a.goto(0,-100)