save project

diy4.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(0)
+pen.hideturtle()
+screen.bgcolor('black')
+
+i=0
+while i<135:
+    pen.pencolor('green')
+    pen.penup()
+    pen.goto(0,0)
+    pen.forward(200)
+    pen.pendown()
+    pen.circle(100)
+    pen.left(2)
+    i+=1
+
+turtle.done()
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