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[More info from Ronald Oussoren]
This is a bug in Tk: 
>>> root = Tkinter.Tk()
Thu May 13 20:45:13 Rivendell.local python[84887] <Error>: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
_RegisterApplication(), FAILED TO establish the default connection to the WindowServer, _CGSDefaultConnection() is NULL.
>>> 2010年05月13日 20:45:16.751 Python[84887:d07] An uncaught exception was raised
2010年05月13日 20:45:16.762 Python[84887:d07] Error (1002) creating CGSWindow
2010年05月13日 20:45:16.955 Python[84887:d07] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Error (1002) creating CGSWindow'
*** Call stack at first throw:
(
	0 CoreFoundation 0x00007fff85e31d24 __exceptionPreprocess + 180
	1 libobjc.A.dylib 0x00007fff860000f3 objc_exception_throw + 45
	2 CoreFoundation 0x00007fff85e31b47 +[NSException raise:format:arguments:] + 103
	3 CoreFoundation 0x00007fff85e31ad4 +[NSException raise:format:] + 148
	4 AppKit 0x00007fff84614aba _NSCreateWindowWithOpaqueShape2 + 473
	5 AppKit 0x00007fff845a9055 -[NSWindow _commonAwake] + 1214
	6 AppKit 0x00007fff845c6d3d -[NSWindow _makeKeyRegardlessOfVisibility] + 96
	7 AppKit 0x00007fff845c6cb2 -[NSWindow makeKeyAndOrderFront:] + 24
	8 Tk 0x000000010075b86c XMapWindow + 155
	9 Tk 0x00000001006ca6d0 Tk_MapWindow + 89
	10 Tk 0x00000001006d35e6 TkToplevelWindowForCommand + 2658
	11 Tcl 0x00000001006300d3 TclServiceIdle + 76
	12 Tcl 0x00000001006162ce Tcl_DoOneEvent + 329
	13 _tkinter.so 0x0000000100595683 Tkapp_CallDeallocArgs + 277
	14 readline.so 0x00000001001f1f9a initreadline + 1280
	15 Python 0x00000001000076a1 PyOS_Readline + 239
	16 Python 0x0000000100008a57 PyTokenizer_FromString + 1322
	17 Python 0x00000001000090a0 PyTokenizer_Get + 154
	18 Python 0x0000000100005698 PyParser_AddToken + 1018
	19 Python 0x00000001000a2320 PyParser_ASTFromFile + 146
	20 Python 0x00000001000a443f PyRun_InteractiveOneFlags + 345
	21 Python 0x00000001000a4615 PyRun_InteractiveLoopFlags + 206
	22 Python 0x00000001000a4685 PyRun_AnyFileExFlags + 76
	23 Python 0x00000001000b0286 Py_Main + 2718
	24 Python 0x0000000100000e6c start + 52
	25 ??? 0x0000000000000001 0x0 + 1
)
terminate called after throwing an instance of 'NSException'
Abort trap
This is running /usr/bin/python in a session as a user that doesn't have access to the GUI. The text above says that there is an uncaught ObjC exception, caused by the lack of a connection to the window server. Tk should have converted that to its own style of errors but didn't.