save project

diy1.py

@@ -2,12 +2,13 @@ import turtle
 
 pen=turtle.Pen()
 screen=turtle.Screen()
-screen.color("black")
+screen.bgcolor("black")
 pen.speed(100)
 a=["red","blue","yellow","pink"]
 pen.color("blue")
 for i in range(1,300):
     pen.forward(i)
+    pen.color(a[i%4])
     pen.right(91)
 pen.hideturtle()
 pen.down()
\ No newline at end of file