save project

diy1.py

@@ -3,8 +3,12 @@
 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
 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
 import turtle
+color=["blue","red","yellow","purple"]
 pen=turtle.Pen()
 pen=turtle.Pen()
+screen=turtle.Screen()
+screen.bgcolor("black")
 for i in range(1,300):
 for i in range(1,300):
+    pen.pencolor(color[i%4])
     pen.forward(i)
     pen.forward(i)
     pen.left(91)
     pen.left(91)
     pen.speed(10000)
     pen.speed(10000)