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This bug seems to break help(C-module) in py3k after rev 70587:
>>> import pickle
>>> help(pickle)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "~/py3k/Lib/site.py", line 429, in __call__
 return pydoc.help(*args, **kwds)
 File "~/py3k/Lib/pydoc.py", line 1709, in __call__
 self.help(request)
 File "~/py3k/Lib/pydoc.py", line 1755, in help
 else: doc(request, 'Help on %s:')
 File "~/py3k/Lib/pydoc.py", line 1505, in doc
 pager(render_doc(thing, title, forceload))
 File "~/py3k/Lib/pydoc.py", line 1500, in render_doc
 return title % desc + '\n\n' + text.document(object, name)
 File "~/py3k/Lib/pydoc.py", line 320, in document
 if inspect.ismodule(object): return self.docmodule(*args)
 File "~/py3k/Lib/pydoc.py", line 1086, in docmodule
 contents.append(self.document(value, key, name))
 File "~/py3k/Lib/pydoc.py", line 321, in document
 if inspect.isclass(object): return self.docclass(*args)
 File "~/py3k/Lib/pydoc.py", line 1131, in docclass
 doc = getdoc(object)
 File "~/py3k/Lib/pydoc.py", line 81, in getdoc
 result = inspect.getdoc(object) or inspect.getcomments(object)
 File "~/py3k/Lib/inspect.py", line 581, in getcomments
 lines, lnum = findsource(object)
 File "~/py3k/Lib/inspect.py", line 524, in findsource
 lines = linecache.getlines(file, module.__dict__)
 File "~/py3k/Lib/linecache.py", line 41, in getlines
 return updatecache(filename, module_globals)
 File "~/py3k/Lib/linecache.py", line 130, in updatecache
 lines = fp.readlines()
 File "~/py3k/Lib/codecs.py", line 300, in decode
 (result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf8' codec can't decode byte 0x80 in position 24:
unexpected code byte
brodierao's patch fixes it.