save project

xx.py

 import turtle
+screen=turtle.Screen()
+screen.bgcolor("black")
 pen = turtle.Pen()
-
+coo=["red","blue","green","yellow"]
 for i in range(1,300):
     pen.forward(i)
-    
+    pen.color(coo[i%4])
     pen.right(91)
-    pen.speed(1000)
+    pen.speed(10000000)
 pen.hideturtle()
 turtle.done()
\ No newline at end of file