save project

diy1.py

@@ -3,6 +3,8 @@
 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
+screen=turtle.Screen
+screen.bgcolor("black")
 colors=["light blue","light pink","yellow","red"]
 pen = turtle.Pen()
 # 请创造师在下面接着创作
@@ -10,7 +12,7 @@ distance=1
 pen.speed(0)
 pen.pencolor("light blue")
 for SB in range(1,300,1):
-    pen.pencolor(colors[1%4])
+    pen.pencolor(colors[SB%4])
     pen.forward(SB)
     distance+=1
     pen.right(91)