我的python乌龟窗口无法打开

Question

有人知道为什么我每次用my_turtle = turtle.Turtle()关闭乌龟屏幕时都无法打开它的原因。

它说像这样：

    Traceback (most recent call last):
  File "<pyshell#6>", line 1, in <module>
    my_turtle = turtle.Turtle()
  File "C:\Python36\lib\turtle.py", line 3816, in __init__
    visible=visible)
  File "C:\Python36\lib\turtle.py", line 2557, in __init__
    self._update()
  File "C:\Python36\lib\turtle.py", line 2660, in _update
    self._update_data()
  File "C:\Python36\lib\turtle.py", line 2646, in _update_data
    self.screen._incrementudc()
  File "C:\Python36\lib\turtle.py", line 1292, in _incrementudc
    raise Terminator
turtle.Terminator

帮助？