save project

diy1.py

 import turtle
 pen=turtle.Pen()
-a=5
+screen=turtle.Screen()
+screen.bgcolor("black")
 pen.speed(50)
 pen.color("blue")
-for i in range(300):
-    pen.forward(a)
+a=["red","green","blue","yellow"]
+for i in range(1,300):
+    pen.color(a[i%4])
+    pen.forward(i)
     pen.left(91)  
-    a+=1
 turtle.done()
+pen.hideturtle()
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