save project

diy1.py

@@ -5,11 +5,15 @@
 import turtle
 
 pen = turtle.Pen()
+sc=turtle.Screen()
+sc.bgcolor("black")
+colors=["red","blue","green","purple"]
+
 # 请创造师在下面接着创作
 
 for i in range(1,300):
     pen.forward(i)
-
+    pen.pencolor(colors[i%4])
     pen.right(91)
 # 隐藏画笔，保存画布
 pen.hideturtle()