在lxml v4.4 之前,lxml.etree.iterwalk遍历元素和处理指令:
使用以下代码:
from lxml import etree
XML = """<root>
<?page no="1"?>
<element key='value'>text</element>
<element>text</element>tail<?page no="2"?>
<empty-element xmlns="http://testns/"/>
</root>"""
context = etree.iterwalk(etree.XML(XML), events=("start",))
for action, elem in context:
if isinstance(elem, etree._ProcessingInstruction):
print(f"{action}: {elem.target} {elem.text}")
else:
print(f"{action}: {elem.tag}")
我有:
start: root
start: page no="1"
start: element
start: element
start: page no="2"
start: {http://testns/}empty-element
但自从 lxml v4.4 及更高版本以来,我有:
start: root
start: element
start: element
start: {http://testns/}empty-element
现在忽略处理指令。为什么?
如何恢复以前的行为?