>>> tree[0]
<Element STATUS at 0x11708d4d0>
>>> tree[0].text
>>> tree[0].text is None
True
如果text将<STATUS>标记的属性设置为空字符串，则应获得所需的内容：
>>> tree[0].text = ''
>>> etree.tostring(tree)
'<ERROR>The status is <STATUS></STATUS>.</ERROR>'
考虑到这一点，您可能可以text在编写XML之前遍历DOM树并修复属性。像这样：
# prevent creation of self-closing tags
for node in tree.iter():
if node.text is None:
node.text = ''
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