xml.etree.ElementTree findall（）行为异常

Question

>>> import xml.etree.ElementTree as ET
>>> t = ET.fromstring('<root><field name="tcp.option_len" ></field></root>')
>>> t.findall('.//field [@name="tcp.option_len"]')
[]

为什么不返回该field ？

Answer 1

只需删除XPath查询b / n字段和方括号[

 t.findall('.//field[@name="tcp.option_len"]')