save project

diy1.py

@@ -3,11 +3,15 @@
 每次移动都增加画笔移动的长度，并旋转91°，重复执行300次，查看效果
 """
 import turtle
-
+s=turtle.Screen()
+s.bgcolor("black")
+color=["red","orange","yellow","green"]
 pen = turtle.Pen()
 # 请创造师在下面接着创作
 
+
 for i in range(1,800,1):
+    pen.color(color[i%4])
     pen.forward(i)
     
     pen.right(91)