解析时lxml删除<？xml ...>标签？

from lxml import etree

# 假设您的XML文档如下
xml_string = '''<?xml version="1.0"?>
<root>
   <child>text</child>
</root>
'''

# 使用XMLParser解析XML文档
parser = etree.XMLParser(remove_blank_text=True, remove_comments=True, remove_pis=True)
tree = etree.fromstring(xml_string, parser)

# 将解析后的XML文档转换为字符串
xml_string_without_pi = etree.tostring(tree, pretty_print=True).decode()

print(xml_string_without_pi)

<root>
   <child>text</child>
</root>