save project

diy1.py

@@ -3,13 +3,14 @@
 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
-
+sb=turtle.Screen()
+sb.bgcolor("black")
 pen = turtle.Pen()
+jlth=["light blue","pink","yellow","green"]
 # 请创造师在下面接着创作
-sb = 1
-for i in range(500):
-    pen.forward(sb)
-    sb+=1
+for i in range(1,500):
+    pen.forward(i)
+    pen.pencolor(jlth[i%4])
     pen.right(91)
 # 隐藏画笔，保存画布
 pen.hideturtle()