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Calls to the widget method tk_focusNext() fail with
"unsubscriptable object" error. Looking at the Tkinter.py 
code for the routine shows this statement:
name = self.tk.call('tk_focusNext', self._w)
(line 433)
which used to return a string in 2.2 but now returns
a "cmdName object". When this is passed to 
self._nametowidget(name), it fails when it tries to
subscript name (line 1006) since the object does
not support indexing. Perhaps str(name) or
name.string is more appropriate now? (when
that change is made, it works--well, I tested
name.string and that worked)
Perry Greenfield (perry@stsci.edu)

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Presumably the same problem exists with tk_focusPrev.

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Presumably, _nametowidget() should be modified to work properly with a "cmdName object", rather than modifying each site that gets a widget path from a tk command. 

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The problem is still not resolved for now (AFAIK).
Here is a very simple patch for Tkinter.py:
*** 432,442 ****
--- 432,446 ----
 to 0."""
 name = self.tk.call('tk_focusNext', self._w)
 if not name: return None
+ try: name=name.string
+ except: pass
 return self._nametowidget(name)
 def tk_focusPrev(self):
 """Return previous widget in the focus order. See
tk_focusNext for details."""
 name = self.tk.call('tk_focusPrev', self._w)
 if not name: return None
+ try: name=name.string
+ except: pass
 return self._nametowidget(name)
 def after(self, ms, func=None, *args):
 """Call function once after given time.
Note: I have made this (try/except) cause I have encountered
cases where "name" was still a string (well, at least with
Python 2.3.1).
David (david.douard*gmail.com)

This problem still persists, at least in Python 2.4. As noted by Perry Greenfield, the same problem occurs in tk_focusPrev, and some other methods as well. Rather than track down all such calls it would be easier to add the line
 name = str(name)
at the top of the nametowidget method.
Rick Litherand.
lither@math.lsu.edu

The bug still exists. Please assign this bug and patch to Martin Loewis if 
possible (I don't have privileges for that).

While we are at it, can't we revamp nametowidget too ?
Patch attached

There was a problem with my previous patch if the widget name was just '.'
New patch attached

Sorry for the previous patch, correct one attached now

Thanks for the patch, committed as r65399, r65400, and r65401.