您可以使用根节点的getchildren（）或iterdescendants（）方法获取ElementTree节点的子节点：
>>> from lxml import etree
>>> from cStringIO import StringIO
>>> t = etree.parse(StringIO("""<body>
... <h1>A title</h1>
... <p>Some text</p>
... </body>"""))
>>> root = t.getroot()
>>> for child in root.iterdescendants(),:
... print etree.tostring(child)
...
<h1>A title</h1>
<p>Some text</p>
可以简写如下：
print ''.join([etree.tostring(child) for child in root.iterdescendants()])
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