def iterators():
"""
Test iterators.
>>> e = ET.XML("<html><body>this is a <i>paragraph</i>.</body>..</html>")
>>> summarize_list(e.iter())
['html', 'body', 'i']
>>> summarize_list(e.find("body").iter())
['body', 'i']
>>> summarize(next(e.iter()))
'html'
>>> "".join(e.itertext())
'this is a paragraph...'
>>> "".join(e.find("body").itertext())
'this is a paragraph.'
>>> next(e.itertext())
'this is a '
Method iterparse should return an iterator. See bug 6472.
>>> sourcefile = serialize(e, to_string=False)
>>> next(ET.iterparse(sourcefile)) # doctest: +ELLIPSIS
('end', <Element 'i' at 0x...>)
>>> tree = ET.ElementTree(None)
>>> tree.iter()
Traceback (most recent call last):
AttributeError: 'NoneType' object has no attribute 'iter'
"""
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