The get_saved tracebacks reported in #35263 and #38128 are the same except for line numbers. The more recent, from 3 days ago on Mac.
Exception in Tkinter callback
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/tkinter/__init__.py", line 1883, in __call__
return self.func(*args)
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/idlelib/multicall.py", line 176, in handler
r = l[i](event)
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/idlelib/filelist.py", line 54, in close_all_callback
reply = edit.close()
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/idlelib/pyshell.py", line 1008, in close
return EditorWindow.close(self)
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/idlelib/editor.py", line 1077, in close
reply = self.maybesave()
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/idlelib/outwin.py", line 94, in maybesave
return 'yes' if self.get_saved() else 'no'
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/idlelib/editor.py", line 1010, in get_saved
return self.undo.get_saved()
AttributeError: 'NoneType' object has no attribute 'get_saved'
None.filename from a day ago is also the same except for line numbers. pyshell line 1008 is in PyShell(OutputWindow(EditorWindow)) so get_saved must result from closing Shell. pyshell line 309 is in PyShellEditorWindow(EditorWindow) so must come from closing an editor window.