save project

diy1.py

@@ -3,9 +3,12 @@
 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
-
 pen = turtle.Pen()
+screen=turtle.Screen()
+screen.bgcolor("black")
+colors=("pink","white","blue","yellow")
 for i  in range(1000):
+    pen.pencolor(colors[i%4])
     pen.right(89)
     pen.forward(i)