save project

和。.py

-import turtle
+import turtle
 import turtle
 pen=turtle.Pen()
-distance=1
-for i in range(1,400,2):
+screen=turtle.Screen()
+screen.bgcolor("black")
+color=["red","orange","green","skyblue"]
+for i in range(1,300,1):
+    pen.color(color[i%4])
     pen.forward(i)
     pen.right(91)
-    distance+=1
 pen.hideturtle()
-turtle.done()
\ No newline at end of file
+turtle.done()