save project

diy1.py

 import turtle
 import turtle
 pen=turtle.Pen()
 pen=turtle.Pen()
-a=1
-for i in range(300):
-    pen.forward(a)
-    a=a+1
+screen=turtle.Screen()
+screen.bgcolor('black')
+a=['red','orange','yellow','green']
+for i in range(1,301,1):
+    pen.color(a[i%4])
+    pen.forward(i)
     pen.right(91) 
     pen.right(91) 
 pen.hideturtle()
 pen.hideturtle()
 turtle.done()
 turtle.done()