Public bug reported:

Binary package hint: python3.1

To reproduce the bug, use the following class:

class x(object):
        TEST = "hello"
        THE_MAXIMUM = 55
        
        def __init__(self, a, b):
                self.a = 3
                self.b = "test"

and set the cursor behind "test". After that use SHIFT + UP (so from 3
to incl. "test" will be marked) and after that use SHIFT + POS1, which
will produce this exception:

>>> Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python2.6/lib-tk/Tkinter.py", line 1413, in __call__
    return self.func(*args)
  File "/usr/lib/python2.6/idlelib/MultiCall.py", line 151, in handler
    r = l[i](event)
  File "/usr/lib/python2.6/idlelib/EditorWindow.py", line 335, in home_callback
    if self.text.compare(first,">",last):
  File "/usr/lib/python2.6/lib-tk/Tkinter.py", line 2863, in compare
    self._w, 'compare', index1, op, index2))
TclError: expected boolean value but got ""

This will appear in all latest Python IDLEs (2.6.4, 3.1.1+). In my
opinion this bug will not only appear in this case but rather in
different ones. I attached a screenshot.

** Affects: python3.1 (Ubuntu)
     Importance: Undecided
         Status: New

-- 
IDLE: raises Exception TclError in a special case
https://bugs.launchpad.net/bugs/597763
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