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Trivial fix: please see attached. As to test_pydoc.py, I don't know the system well enough to fiddle with it, but something like this should work (untested):
 def test_unreadable_dir(self):
 ''' pydoc should handle unreadable subdirs gracefully '''
 @contextmanager
 def mk_unreadable_dir():
 top_level_dir = tempfile.mkdtemp()
 bad_dir = tempfile.mkdtemp(dir=top_level_dir)
 os.chmod(bad_dir, 0)
 os.chdir(top_level_dir)
 yield
 os.removedirs(top_level_dir)
 with mk_unreadable_dir():
 doc = pydoc.render_doc('modules')
 self.assertTrue("modules" in doc)