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LANG=C python3.2 -c 'import urllib.parse; help(urllib.parse)'
Traceback (most recent call last):
 File "<string>", line 1, in <module>
 File "/usr/lib/python3.2/site.py", line 477, in __call__
 return pydoc.help(*args, **kwds)
 File "/usr/lib/python3.2/pydoc.py", line 1778, in __call__
 self.help(request)
 File "/usr/lib/python3.2/pydoc.py", line 1828, in help
 else: doc(request, 'Help on %s:', output=self._output)
 File "/usr/lib/python3.2/pydoc.py", line 1564, in doc
 pager(render_doc(thing, title, forceload))
 File "/usr/lib/python3.2/pydoc.py", line 1372, in pager
 pager(text)
 File "/usr/lib/python3.2/pydoc.py", line 1392, in <lambda>
 return lambda text: pipepager(text, 'less')
 File "/usr/lib/python3.2/pydoc.py", line 1413, in pipepager
 pipe.write(text)
UnicodeEncodeError: 'ascii' codec can't encode character '\xab' in position 5495: ordinal not in range(128)
presumably the offending part is 
 quote_from_bytes(b'abc def«') -> 'abc%20def%AB'
debian python3.2 3.2.3~rc2-1
macports python32 @3.2.3_0

This works fine for me on Gentoo Linux with both 3.2.3+ (ie: what's in the repo) and 3.2.2.

Ah, I should clarify: Gentoo's 3.2.2. I'm sure they've added some patches, just like Debian.

Serhiy: did you add 3.3 because you can reproduce it on 3.3?

New changeset ea25ce432343 by Senthil Kumaran in branch '3.2':
Issue #14920: Fix the help(urllib.parse) failure on locale C terminals. Just have ascii in help msg
http://hg.python.org/cpython/rev/ea25ce432343
New changeset cb62c958dd6a by Senthil Kumaran in branch 'default':
Issue #14920: Fix the help(urllib.parse) failure on locale C terminals. Just have ascii in help msg
http://hg.python.org/cpython/rev/cb62c958dd6a 

I have fixed the help to include only ascii characters ( represented in hex) so that conversion to bytes is represented in the help and also the terminal whose LANG is C is able to display them too.
On Ubuntu, when I had LANG=C, locale gave the following o/p and the previous help, (which broke for the Tuukka Tolvanen) was working fine too.
LANG=C
LANGUAGE=en_US:en
LC_CTYPE=en_US.UTF-8
LC_NUMERIC="C"
LC_TIME="C"
LC_COLLATE=en_US.UTF-8
LC_MONETARY="C"
LC_MESSAGES=en_US.UTF-8
LC_PAPER="C"
LC_NAME="C"
LC_ADDRESS="C"
LC_TELEPHONE="C"
LC_MEASUREMENT="C"
LC_IDENTIFICATION="C"
LC_ALL=
I guess, the original bug could be related to settings differing on gentoo. Anyways, the help docstring is changed now.

IMO the right fix would have been to make the docstring a raw string.