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Platform: Linux
Python 3.1.1 built from source. Tk version 8.4, Tcl version 8.4.
Idle 2.6.4 (also built from source), works correctly (executes force-open-completions).
Test case:
- Start idle3
- press Ctrl-Space in the IDLE shell
- idle crashes, and a traceback is written to stdout:
Traceback (most recent call last):
 File "/usr/local/bin/idle3", line 6, in <module>
 main()
 File "/usr/local/lib/python3.1/idlelib/PyShell.py", line 1420, in main
 root.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