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In py3k branch r57057, when I run::
 import Tkinter
 tk = Tkinter.Tk()
 text = Tkinter.Text(tk)
 def callback(event=None):
 return
 text.bind('<Control-space>', callback)
 text.pack()
 text.focus_set()
 tk.mainloop()
when I press C-space I get this exception::
 Traceback (most recent call last):
 File "spacefailure.py", line 13, in <module>
 tk.mainloop()
 File "/usr/local/lib/python3.0/lib-tk/Tkinter.py", line 1022, in mainloop
 self.tk.mainloop(n)
 UnicodeDecodeError: 'utf8' codec can't decode bytes in position 0-1: illegal encoding
The strange thing about it is that other bindings work
as expected.
I'm running on ubuntu feisty.