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When running the attached program, it will fail with above message on
Control-2 only! All other control keys work happily.
The same program under MS-Windows seems to work (I am under Linux, so I
can't switch easily). 
My version of Python:
Python 3.1 (r31:73572, Jul 18 2009, 08:33:59) 
[GCC 4.3.3] on linux2
uname -a: Linux lin-wpl 2.6.28-13-generic #45-Ubuntu SMP Tue Jun 30
19:49:51 UTC 2009 i686 GNU/Linux
Do I have to replace the line: 
 self.c.bind('<Control-Key-' + str(i) + '>',
 lambda x=str(i): self.key_control_num(x))
with something different? str->unicode, bytes???
This does not help either:
bytes("<Control-Key-" + str(i) + ">", 'utf-8')
This program has been converted via 2to3.

Can you paste the full traceback?
I tried to run the script on Windows and nothing happened when I pressed
Ctrl+[0..9].

As I said, it does work on Windows, but NOT on Linux!
Her is the full traceback:
wplapper@lin-wpl:~/sudoku/version3.0/tk_test/python3$ python3 tkpy_70.py
key_control_num 1 (# I pressed Control-1)
Traceback (most recent call last):
 File "tkpy_70.py", line 27, in <module>
 app.mainloop()
 File "/usr/local/lib/python3.1/tkinter/__init__.py", line 1009, in
mainloop
 self.tk.mainloop(n)
UnicodeDecodeError: 'utf8' codec can't decode bytes in position 0-1:
illegal encoding

Is it possible that this issue is related to issue6144?
BTW: I have to handcomile my python 3.1 :)

The same problems (ctrl+space and ctrl+2) were reported in #1028.
Closing this as duplicate.

I have verified that the problem goes away when you switch from
tcl/tk8.4 to tcl/tk8.5 . Luckily my Ubuntu 9.04 has the 8.5-version
available for install. Thanks for the quick help!

wplapper@lin-wpl:~/sudoku/version3.0/tk_test/python3$ python3
Python 3.1 (r31:73572, Jul 18 2009, 11:13:40) 
[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import tkinter
>>> print(tkinter.Tcl().tk.call('info', 'patchlevel'))
8.5.6

Do you know what 8.5.x version were you running before?
You should report it to #1028, apparently they were trying to find out
the affected versions there.