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I was editing in idle in python 3.1, typing away. I had been doing it for hours. I do not think I had jumped to the shell window. Suddenly idle crashed, with this error message in the the ubuntu 9,10 terminal window:
Traceback (most recent call last):
 File "/usr/bin/idle3", line 5, in <module>
 main()
 File "/usr/lib/python3.1/idlelib/PyShell.py", line 1420, in main
 root.mainloop()
 File "/usr/lib/python3.1/tkinter/__init__.py", line 1012, in mainloop
 self.tk.mainloop(n)
UnicodeDecodeError: 'utf8' codec can't decode bytes in position 0-1: illegal encoding
I do not know what key combination I had just typed. I may have just hit a crtl or alt combination.
The hardware is an Acer notebook.
This is certainly an exception that should be caught! I did not get to even save my work.