[英]XML: How to get Elements by Attribute Value - Python 2.7 and minidom
I want to get a list of XML Elements based first on TagName and second on Attribute Value. 我想首先在TagName上获取XML元素列表,然后在属性值上获取第二个 XML元素列表。 I´m using the xml.dom library and python 2.7.
我正在使用xml.dom库和python 2.7。
While it´s easy to get the first step done: 虽然很容易完成第一步:
from xml.dom import minidom
xmldoc = minidom.parse(r"C:\File.xml")
PFD = xmldoc.getElementsByTagName("PFD")
PNT = PFD.getElementsByTagName("PNT")
I´ve been looking around but cannot find a solution for the second step. 我一直在环顾四周,但找不到第二步的解决方案。 Is there something like a
.getElementsByAttributeValue
that would give me a list to work with? 是否有类似
.getElementsByAttributeValue
东西可以给我一个列表来使用?
If the XML looks like this 如果XML看起来像这样
<PFD>
<PNT A="1" B=.../>
<PNT A="1" B=.../>
<PNT A="2" B=.../>
</PFD>
In need all PNTs where A="1" in a list. 需要所有PNT,其中A =“1”在列表中。
If you aren't limited to using xml.dom.minidom, lxml has better search functionality. 如果您不限于使用xml.dom.minidom,则lxml具有更好的搜索功能。 Note that lxml is not builtin, and will require installing the lxml package and non-Python dependencies.
请注意,lxml不是内置的,需要安装lxml包和非Python依赖项。
Eg: 例如:
>>> from lxml import etree
>>> root = etree.parse(r"C:\File.xml")
>>> for e in root.findall('PNT[@A="1"]'):
... print etree.tostring(e)
<PNT A="1" B="c"/>
<PNT A="1" B="b"/>
Lxml also supports all of XPath via element.xpath('query')
. Lxml还通过
element.xpath('query')
支持所有XPath 。 Other convenience functions include element.findtext
which finds the appropriate element and returns the text of it, element.find
and element.findall
which returns the first/list of all elements matching a query using a subset of XPath covering common queries. 其他方便的功能包括
element.findtext
指找到适当的元素,并返回它的文本, element.find
和element.findall
返回匹配使用XPath的覆盖通用查询的子集的查询的所有元件的第一/列表。
If you don't find a built-in method, why not iterate over the items? 如果您没有找到内置方法,为什么不迭代这些项?
from xml.dom import minidom
xmldoc = minidom.parse(r"C:\File.xml")
PFD = xmldoc.getElementsByTagName("PFD")
PNT = xmldoc.getElementsByTagName("PNT")
for element in PNT:
if element.getAttribute('A') == "1":
print "element found"
Adding the items to a list should be easy now. 将项目添加到列表应该很容易。
Try this: 试试这个:
from xml.dom import minidom
xmldoc = minidom.parse(r"C:\File.xml")
PNT = xmldoc.getElementsByTagName("PNT")
for element in PNT:
print element.attributes.keys()
for elem in element.attributes.values():
print elem.firstChild.data
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