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When I start IDLE I get this:
Python 3.0a2 (r30a2:59382, Dec 10 2007, 14:21:37) 
[GCC 4.1.2 20070626 (Red Hat 4.1.2-13)] on linux2
Type "copyright", "credits" or "license()" for more information.
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 makes to its subprocess using this computer's internal loopback
 interface. This connection is not visible on any external
 interface and no data is sent to or received from the Internet.
 ****************************************************************
 
IDLE 3.0a1 
>>>
That's fine (if slightly confusing regarding the version numbers), but
if I click Options->Configure I get this error output:
: Exception in Tkinter callback
Traceback (most recent call last):
 File "/home/mark/opt/python30a2/lib/python3.0/lib-tk/Tkinter.py", line
1402, 
in __call__
 return self.func(*args)
 File
"/home/mark/opt/python30a2/lib/python3.0/idlelib/EditorWindow.py", line 
385, in config_dialog
 configDialog.ConfigDialog(self.top,'Settings')
 File
"/home/mark/opt/python30a2/lib/python3.0/idlelib/configDialog.py", line 
50, in __init__
 self.CreateWidgets()
 File
"/home/mark/opt/python30a2/lib/python3.0/idlelib/configDialog.py", line 
69, in CreateWidgets
 page_names=['Fonts/Tabs','Highlighting','Keys','General'])
 File "/home/mark/opt/python30a2/lib/python3.0/idlelib/tabbedpages.py",
line 
398, in __init__
 self.add_page(name)
 File "/home/mark/opt/python30a2/lib/python3.0/idlelib/tabbedpages.py",
line 
413, in add_page
 self._tab_set.add_tab(page_name)
 File "/home/mark/opt/python30a2/lib/python3.0/idlelib/tabbedpages.py",
line 
76, in add_tab
 self._arrange_tabs()
 File "/home/mark/opt/python30a2/lib/python3.0/idlelib/tabbedpages.py",
line 
163, in _arrange_tabs
 for row_index in xrange(n_rows):
NameError: global name 'xrange' is not defined
I tried changing xrange to range, but that doesn't work:
: Exception in Tkinter callback
Traceback (most recent call last):
 File "/home/mark/opt/python30a2/lib/python3.0/lib-tk/Tkinter.py", line
1402, 
in __call__
 return self.func(*args)
 File
"/home/mark/opt/python30a2/lib/python3.0/idlelib/EditorWindow.py", line 
385, in config_dialog
 configDialog.ConfigDialog(self.top,'Settings')
 File
"/home/mark/opt/python30a2/lib/python3.0/idlelib/configDialog.py", line 
50, in __init__
 self.CreateWidgets()
 File
"/home/mark/opt/python30a2/lib/python3.0/idlelib/configDialog.py", line 
69, in CreateWidgets
 page_names=['Fonts/Tabs','Highlighting','Keys','General'])
 File "/home/mark/opt/python30a2/lib/python3.0/idlelib/tabbedpages.py",
line 
398, in __init__
 self.add_page(name)
 File "/home/mark/opt/python30a2/lib/python3.0/idlelib/tabbedpages.py",
line 
413, in add_page
 self._tab_set.add_tab(page_name)
 File "/home/mark/opt/python30a2/lib/python3.0/idlelib/tabbedpages.py",
line 
76, in add_tab
 self._arrange_tabs()
 File "/home/mark/opt/python30a2/lib/python3.0/idlelib/tabbedpages.py",
line 
148, in _arrange_tabs
 for tab_name in self._tabs.keys():
RuntimeError: dictionary changed size during iteration

Amaury Forgeot d'Arc says he's fixed this in change 59456 (but I don't
know how---or if---I can change its status).

Fixed in r59456