This probably isn't a traceback that's likely to happen, but I wanted to document it since I was able to recreate it.

To recreate:
In a new shell, do Select All, then Find Selection.


Exception in Tkinter callback
Traceback (most recent call last):
  File "N:\projects\cpython\lib\tkinter\__init__.py", line 1883, in __call__
    return self.func(*args)
  File "N:\projects\cpython\lib\idlelib\editor.py", line 644, in find_selection_event
    search.find_selection(self.text)
  File "N:\projects\cpython\lib\idlelib\search.py", line 25, in find_selection
    return _setup(text).find_selection(text)
  File "N:\projects\cpython\lib\idlelib\search.py", line 72, in find_selection
    return self.find_again(text)
  File "N:\projects\cpython\lib\idlelib\search.py", line 65, in find_again
    self.bell()
AttributeError: 'SearchDialog' object has no attribute 'bell'