pyexpat.XMParserType broken (was: pydoc doesn't work on pyexpat)

[nnorwitz]

BPO	1020
Nosy	@gvanrossum, @freddrake, @tiran

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/freddrake'
closed_at = <Date 2007-11-21.00:55:13.090>
created_at = <Date 2007-08-25.17:27:41.660>
labels = ['library']
title = "pyexpat.XMParserType broken (was: pydoc doesn't work on pyexpat)"
updated_at = <Date 2008-01-06.22:29:45.331>
user = 'https://bugs.python.org/nnorwitz'

bugs.python.org fields:

activity = <Date 2008-01-06.22:29:45.331>
actor = 'admin'
assignee = 'fdrake'
closed = True
closed_date = <Date 2007-11-21.00:55:13.090>
closer = 'christian.heimes'
components = ['Library (Lib)']
creation = <Date 2007-08-25.17:27:41.660>
creator = 'nnorwitz'
dependencies = []
files = []
hgrepos = []
issue_num = 1020
keywords = []
message_count = 3.0
messages = ['55289', '57251', '57721']
nosy_count = 4.0
nosy_names = ['gvanrossum', 'fdrake', 'nnorwitz', 'christian.heimes']
pr_nums = []
priority = 'high'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue1020'
versions = ['Python 3.0']

[nnorwitz]

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

[tiran]

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.

[tiran]

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