save project

diy1.py

@@ -7,8 +7,8 @@ a = turtle.Pen()
 d=turtle.Screen()
 c=["red","blue","green","yellow"]
 d.bgcolor("black")
-for b in range(1,500):
-    a.pencolor(c[b%4])
+for i in range(1,500):
+    a.pencolor(c[i%4])
     a.forward(i)
     a.right(100)
 a.hideturtle()