从lxml中选择属性值 [英] selecting attribute values from lxml
本文介绍了从lxml中选择属性值的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想使用xpath表达式获取属性的值.
I want to use an xpath expression to get the value of an attribute.
我希望以下内容能起作用
I expected the following to work
from lxml import etree
for customer in etree.parse('file.xml').getroot().findall('BOB'):
print customer.find('./@NAME')
但这会导致错误:
Traceback (most recent call last):
File "bob.py", line 22, in <module>
print customer.find('./@ID')
File "lxml.etree.pyx", line 1409, in lxml.etree._Element.find (src/lxml/lxml.etree.c:39972)
File "/usr/local/lib/python2.7/dist-packages/lxml/_elementpath.py", line 272, in find
it = iterfind(elem, path, namespaces)
File "/usr/local/lib/python2.7/dist-packages/lxml/_elementpath.py", line 262, in iterfind
selector = _build_path_iterator(path, namespaces)
File "/usr/local/lib/python2.7/dist-packages/lxml/_elementpath.py", line 246, in _build_path_iterator
selector.append(ops[token[0]](_next, token))
KeyError: '@'
我期望它能正常工作吗?
Am I wrong to expect this to work?
推荐答案
find
和findall
仅实现XPath的子集.它们的存在是为了提供与其他ElementTree实现(例如ElementTree
和cElementTree
)的兼容性.
find
and findall
only implement a subset of XPath. Their presence is meant to provide compatibility with other ElementTree implementations (like ElementTree
and cElementTree
).
相反,xpath
方法提供对XPath 1.0的完全访问权限:
The xpath
method, in contrast, provides full access to XPath 1.0:
print customer.xpath('./@NAME')[0]
但是,您可以改用get
:
print customer.get('NAME')
或attrib
:
print customer.attrib['NAME']
这篇关于从lxml中选择属性值的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文