save project

diy1.py

@@ -5,11 +5,13 @@
 import turtle
 
 pen = turtle.Pen()
+colors=["red","orange","yellow","green"]
 # 请创造师在下面接着创作
-
+screen=turtle.Screen()
+screen.bgcolor("black")
 for i in range(1,300):
     pen.forward(i)
-    
+    pen.pencolor(colors[i%4])
     pen.right(91)
 # 隐藏画笔，保存画布
 pen.hideturtle()