IDLE 3 crashes on Ctrl+Space with "'utf8' codec can't decode bytes in position 0-1"

[Yinon]

BPO	6920
Nosy	@ezio-melotti

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2009-09-16.10:07:21.274>
created_at = <Date 2009-09-16.08:30:52.543>
labels = ['expert-IDLE', 'type-crash']
title = 'IDLE 3 crashes on Ctrl+Space with "\'utf8\' codec can\'t decode bytes in position 0-1"'
updated_at = <Date 2009-09-16.10:07:21.261>
user = 'https://bugs.python.org/Yinon'

bugs.python.org fields:

activity = <Date 2009-09-16.10:07:21.261>
actor = 'ezio.melotti'
assignee = 'none'
closed = True
closed_date = <Date 2009-09-16.10:07:21.274>
closer = 'ezio.melotti'
components = ['IDLE']
creation = <Date 2009-09-16.08:30:52.543>
creator = 'Yinon'
dependencies = []
files = []
hgrepos = []
issue_num = 6920
keywords = []
message_count = 2.0
messages = ['92667', '92676']
nosy_count = 2.0
nosy_names = ['Yinon', 'ezio.melotti']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue6920'
versions = ['Python 3.1']

[Yinon]

on Ubuntu 8.04 -
I downloaded the sources, then:
./configure --prefix=$HOME
make && make install

in ~/bin/idle3 when I press Ctrl+Space (according to the "Edit" menu,
should show completions) idle crashes with the following traceback:
Traceback (most recent call last):
  File "/homes/yinon/bin/idle3", line 5, in <module>
    main()
  File "/homes/yinon/lib/python3.1/idlelib/PyShell.py", line 1420, in main
    root.mainloop()
  File "/homes/yinon/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

[ezio-melotti]

This is a duplicate of bpo-1028.