python - Turtle exitonclick 使用时会报错

Question

我一直在玩 python turtle，我似乎无法让 exitonclick 函数工作，每当我单击窗口试图关闭屏幕时，它都会返回错误。我还尝试删除 mainloop，这会删除错误消息但也不会关闭窗口。

我的代码如下：

import turtle

wn = turtle.Screen()
circle1 = turtle.Turtle(shape = 'circle')

circle1.fd(100)


wn.exitonclick()

wn.mainloop()

错误信息是：

Traceback (most recent call last):
  File "/Users/luke/test.py", line 11, in <module>
    wn.mainloop()
  File "/Users/luke/Applications/Thonny.app/Contents/Frameworks/Python.framework/Versions/3.7/lib/python3.7/turtle.py", line 813, in mainloop
    TK.mainloop()
  File "/Users/luke/Applications/Thonny.app/Contents/Frameworks/Python.framework/Versions/3.7/lib/python3.7/tkinter/__init__.py", line 560, in mainloop
    _default_root.tk.mainloop(n)
AttributeError: 'NoneType' object has no attribute 'tk'