In the below XML, I want to parse it and update the value of "alcohol" to "yes" for all the attributes where age>21. I'm having a problem with it being a node buried inside other nodes. Could someone help me understand how to handle this?
Here's the XML again..
<root xmlns="XYZ" usingPalette="">
<grandParent hostName="XYZ">
<parent>
<child name="JohnsDad">
<grandChildren name="John" sex="male" age="22" alcohol="no"/>
</child>
<child name="PaulasDad">
<grandChildren name="Paula" sex="female" age="15" alcoho="no"/>
</child>
</parent>
</grandParent>
</root>
I tried find all and find method using this document here ( http://pymotw.com/2/xml/etree/ElementTree/parse.html ) but it didn't find it. For example, following code returns no results
for node in tree.findall('.//grandParent'):
print node
import xml.etree.ElementTree as ET
tree = ET.parse('data')
for node in tree.getiterator():
if int(node.attrib.get('age', 0)) > 21:
node.attrib['alcohol'] = 'yes'
root = tree.getroot()
ET.register_namespace("", "XYZ")
print(ET.tostring(root))
yields
<root xmlns="XYZ" usingPalette="">
<grandParent hostName="XYZ">
<parent>
<child name="JohnsDad">
<grandChildren age="22" alcohol="yes" name="John" sex="male" />
</child>
<child name="PaulasDad">
<grandChildren age="15" alcoho="no" name="Paula" sex="female" />
</child>
</parent>
</grandParent>
</root>
By the way, since the XML uses the namespace "XYZ", you must specify the namespace in your XPath:
for node in tree.findall('.//{XYZ}grandParent'):
print node
That will return the grandParent element, but since you want to inspect all subnodes, I think using getiterator
is easier here.
To preserve comments while using xml.etree.ElementTree
you could use the custom parser Fredrik Lundh shows here :
import xml.etree.ElementTree as ET
class PIParser(ET.XMLTreeBuilder):
"""
http://effbot.org/zone/element-pi.htm
"""
def __init__(self):
ET.XMLTreeBuilder.__init__(self)
# assumes ElementTree 1.2.X
self._parser.CommentHandler = self.handle_comment
self._parser.ProcessingInstructionHandler = self.handle_pi
self._target.start("document", {})
def close(self):
self._target.end("document")
return ET.XMLTreeBuilder.close(self)
def handle_comment(self, data):
self._target.start(ET.Comment, {})
self._target.data(data)
self._target.end(ET.Comment)
def handle_pi(self, target, data):
self._target.start(ET.PI, {})
self._target.data(target + " " + data)
self._target.end(ET.PI)
tree = ET.parse('data', PIParser())
Note that if you install lxml , you could instead use:
import lxml.etree as ET
parser = ET.XMLParser(remove_comments=False)
tree = etree.parse('data', parser=parser)
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