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Modification to "customer key set" would make IDLE fail to start
To re-produce:
1, Start IDLE, and switch to Preference -> Keys;
2, Make modification to the key binding;
3, Click Apply, then click OK
4, repeat above steps.
The 2nd time to click OK would not get any response.
But this is not the nightmare. Now quit IDLE and restart IDLE. But IDLE 
cannot restart.
I believe that issue5707 is still exist in Ver. 3.1.1 for Mac OS X.
OS: Mac OS X 10.6.1
Python version: 3.1.1
The error message from console of Mac OS X is attached as following:
-------------------------------
Last login: Sat Nov 7 03:34:20 on ttys000
/Applications/Python\ 3.1/IDLE.app/Contents/MacOS/IDLE ; exit;
localhost:~ gcd$ /Applications/Python\ 3.1/IDLE.app/Contents/MacOS/IDLE 
; exit;
Traceback (most recent call last):
 File "/Applications/Python 
3.1/IDLE.app/Contents/Resources/idlemain.py", line 73, in <module>
 main()
 File 
"/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/idlelib
/PyShell.py", line 1386, in main
 flist.new()
 File 
"/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/idlelib
/FileList.py", line 49, in new
 return self.EditorWindow(self, filename)
 File 
"/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/idlelib
/PyShell.py", line 107, in __init__
 EditorWindow.__init__(self, *args)
 File 
"/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/idlelib
/EditorWindow.py", line 135, in __init__
 self.apply_bindings()
 File 
"/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/idlelib
/EditorWindow.py", line 961, in apply_bindings
 text.event_add(event, *keylist)
 File 
"/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/idlelib
/MultiCall.py", line 359, in event_add
 widget.event_add(self, virtual, seq)
 File 
"/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/tkinter
/__init__.py", line 1353, in event_add
 self.tk.call(args)
_tkinter.TclError: bad event type or keysym "Control"
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