save project

diy1.py

@@ -3,8 +3,10 @@
 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
-
-
+screen=turtle.Screen()
+screen.bgcolor("black")
+colors=["red","orange","green","yellow"]
+pen.pencolors(colors[i%4])
 pen = turtle.pen()
 
 for i in range(1,300):