save project

diy1.py

@@ -4,10 +4,14 @@
 """
 import turtle
 pen = turtle.Pen()
+screen = turtle.Screen()
+screen.bgcolor("black")
+colors=["red","orange","yellow","green"]
 # 请创造师在下面接着创作
 for i in range(1,300):
     pen.left(91)
     pen.forward(i)
+    pen.pencolor(colors[i%4])
 # 隐藏画笔，保存画布
 pen.hideturtle()
-turtle.done()
\ No newline at end of file
+turtle.done()