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help(pyexpat) causes an exception:
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/home/neal/python/dev/py3k/Lib/site.py", line 350, in __call__
 return pydoc.help(*args, **kwds)
 File "/home/neal/python/dev/py3k/Lib/pydoc.py", line 1685, in __call__
 self.help(request)
 File "/home/neal/python/dev/py3k/Lib/pydoc.py", line 1729, in help
 else: doc(request, 'Help on %s:')
 File "/home/neal/python/dev/py3k/Lib/pydoc.py", line 1512, in doc
 pager(render_doc(thing, title, forceload))
 File "/home/neal/python/dev/py3k/Lib/pydoc.py", line 1490, in 
render_doc
 return title % desc + '\n\n' + text.document(object, name)
 File "/home/neal/python/dev/py3k/Lib/pydoc.py", line 319, in document
 if inspect.ismodule(object): return self.docmodule(*args)
 File "/home/neal/python/dev/py3k/Lib/pydoc.py", line 1076, in 
docmodule
 contents.append(self.document(value, key, name))
 File "/home/neal/python/dev/py3k/Lib/pydoc.py", line 320, in document
 if inspect.isclass(object): return self.docclass(*args)
 File "/home/neal/python/dev/py3k/Lib/pydoc.py", line 1126, in docclass
 mro = deque(inspect.getmro(object))
TypeError: 'NoneType' object is not iterable

It's not a problem with pydoc but a problem in the pyexpat module. I
believe that the C code is broken. See for yourself:
>>> dir(pyexpat.XMLParserType)
['__class__', '__delattr__', '__dir__', '__doc__', '__eq__',
'__format__', '__ge__', '__getattribute__', '__gt__', '__hash__',
'__init__', '__le__', '__lt__', '__ne__', '__new__', '__reduce__',
'__reduce_ex__', '__repr__', '__setattr__', '__str__', 'xZK\x08']
There is an issue in the method list. Since most lines of pyexpat were
written by fdrake I'm assigning the bug to him.

Fixed in r59083
The sentinel in the methods list of XMLparsetype was missing.