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The docs for optparse say this:
OptionParser.get_option_group(opt_str)
 Return, if defined, the OptionGroup that has the title or the long description equals to opt_str
After failing to get this to work at all, I looked at the implementation, and the documentation is completely wrong. The method takes an option string, like '-o' or '--option' and returns the option group that it belongs to.
Personally, I would much prefer the function to do what the documentation describes, i.e. find the option group with the given name, but I guess it's far too late for that. The scenario I'm in is that I'm writing a plugin for an existing tool which provides access to its OptionParser to add new options, but doesn't provide references to any of the groups that are already created.
It looks like this documentation was added recently:
http://bugs.python.org/issue1665333 

Attached a patch for 2.7.

Petri,
I think the "to" after "belongs" is redundant.
Also, the issue lists 3.2 and 3.3 - is the fix relevant there too? If yes, can you prepare a patch for 3.2? (I will merge it to 3.3 too)

Yep, the "to" is already present before the verb :)
I think we mark None as ``None``, not *None*. (If the rest of the file does otherwise, then do that.)

Updated the patch:
- Removed the extra "to"
- Changed *None* to ``None`` for conformance with the rest of the file
The same patch applies unmodified to 2.7 and 3.2 branches.

Armin, adding you as the optparse expert - could you see the doc change makes sense?
[I will then do the commit work]

It does make sense, please commit.

New changeset 5a248fcfa112 by Eli Bendersky in branch '2.7':
Issue #11699: fix documentation of OptionParser.get_option_group. Patch by Petri Lehtinen
http://hg.python.org/cpython/rev/5a248fcfa112 

New changeset cfb60dfa7734 by Eli Bendersky in branch '3.2':
Issue #11699: fix documentation of OptionParser.get_option_group. Patch by Petri Lehtinen
http://hg.python.org/cpython/rev/cfb60dfa7734
New changeset 27b588dd6155 by Eli Bendersky in branch 'default':
Merge 3.2: Issue #11699: fix documentation of OptionParser.get_option_group. Patch by Petri Lehtinen
http://hg.python.org/cpython/rev/27b588dd6155 

Done. 
Petri - thanks for the contribution.