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diy1.py

 # 悟空想海龟作图画出弹簧隧道，但是出现了bug，运行不了，请你帮助他，修改bug~
 import turtle 
-
 pen=turtle.Pen()
 screen=turtle.Screen()
 pen.speed('fast')
 pen.hideturtle()
 screen.bgcolor('black')
-
 i=0
 while i<135:
-    screen.pencolor('pink')
+    pen.pencolor('pink')
     pen.penup()
     pen.goto(0,0)
     pen.forward(200)
     pen.pendown()
-    screen.circle(100)
+    pen.circle(100)
     pen.left(2)
     i+=1
-
 turtle.done()
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