[英]XPATH - get tuples of parent and child
Suppose this is my XML: 假设这是我的XML:
<animals>
<mammals>
<an>dog</an>
<an>cat</an>
</mammals>
<reptiles>
<an>snake</an>
</reptiles>
</animals>
What I want is to get tuples like that using xpath
: 我想要的是使用
xpath
获得类似的元组:
(mammals,dog)
(mammals,cat)
(reptiles,snake)
To get each of them separately, or both of them with 2 queries is easy. 要分别获取它们,或者通过两个查询来获取它们都很容易。 I was wondering if there is a way to get it (or very similar output) in 1 xpath query.
我想知道是否有一种方法可以在1个xpath查询中获取它(或非常相似的输出)。
Any help will be appreciated! 任何帮助将不胜感激!
from io import StringIO
from lxml import etree
xml = """<animals>
<mammals>
<an>dog</an>
<an>cat</an>
</mammals>
<reptiles>
<an>snake</an>
</reptiles>
</animals>"""
tree = etree.parse(StringIO(xml))
for x in tree.xpath("/animals/*"):
for y in x:
print((x.tag, y.text))
Output: 输出:
('mammals', 'dog')
('mammals', 'cat')
('reptiles', 'snake')
Try using xml
module in python 尝试在python中使用
xml
模块
from xml.etree import ElementTree
def parse_data(xml_str):
output = []
tree = ElementTree.fromstring(xml_str)
for m in tree.getchildren():
for n in m.getchildren():
output.append((m.tag, n.text,))
return output
xml_str = '''
<animals>
<mammals>
<an>dog</an>
<an>cat</an>
</mammals>
<reptiles>
<an>snake</an>
</reptiles>
</animals>'''
print parse_data(xml_str)
# output: [('mammals', 'dog'), ('mammals', 'cat'), ('reptiles', 'snake')]
In XPath 2.0 or above you can use for
construct ( demo ) : 在XPath 2.0或以上,你可以使用
for
结构( 演示 ):
for $x in /animals/*/*
return concat($x/parent::*/name(), ',', $x/text())
But in lxml
, which only supports XPath 1.0, we need to replace it with python's for
loop : 但是在仅支持XPath 1.0的
lxml
,我们需要将其替换为python的for
循环:
from lxml import etree
raw = """<animals>
<mammals>
<an>dog</an>
<an>cat</an>
</mammals>
<reptiles>
<an>snake</an>
</reptiles>
</animals>"""
root = etree.fromstring(raw)
for x in root.xpath("/animals/*/*"):
print (x.getparent().tag, x.text)
This xpath returns the requested string but only for the first element. 该xpath返回请求的字符串,但仅返回第一个元素。 Could be hard to do with pure XPath
使用纯XPath可能很难
'concat("(", local-name(//animals/*), ",", //animals/*/an/text(), ")")'
xmllint --xpath 'concat("(", local-name(//animals/*), ",", //animals/*/an/text(), ")")' ~/tmp/test.xml
(mammals,dog)
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