save project

diy1.py

@@ -5,9 +5,12 @@
 import turtle
 
 pen = turtle.Pen()
+screen = turtle.Screen()
+screen.bgcolor("black")
 # 请创造师在下面接着创作
-
+colors = ["black","red","black","red"]
 for i in range(1,300):
+    pen.color(colors[i%4])
     pen.forward(i)
     pen.right(91)
 # 隐藏画笔，保存画布