CODEWITHSUNDEEP
pythonxmlparsingelementtree
Mihir Patel
Mihir Patel

Reputation: 2392

Parse XML tag's attribute value via ElementTree AND replace the value string

I am new to Python and trying to automate a task. I have spent two days reading the docs, looked into various other similar questions, but now, I've hit a wall and can't move forward.

I feel Python docs are not well documented on Elementtree module. Maybe it is just me. Also, I know I can use other modules. But please direct me with only Elementtree. Please help me guide forward.

The task is to parse XML and use Elementtree to replace all tag's attribute value. In web-server-parm, I need to replace ALL links which contains "http://api-stg.link.com." For ex...

FROM

"ServerAddr="http://api-stg.link.com/dataapi/v2/exchangerates/"

TO

"ServerAddr="http://api-DATA-stg.link.com/dataapi/v2/exchangerates/".

XML test.xml

<?xml version="1.0" encoding="utf-8"?>
<ConfigRoot>
  <max-layer layer="5"/>
  <enabled-cache status="0"/>
  <server type="fgrfreefr">
    <web-server-parm mode="QA" ServerAddr="http://api-stg.link.com/dataapi/v2/securities?response=complex&amp;limit=9999999" timedOut="10000" X-API-UserId="54456464561" X-API-ProductId="ADS" ApiKey="fgggdfvdffdgdfg"/>
    <web-server-parm mode="UAT" ServerAddr="http://api-uat.link.com/dataapi/v2/securities?response=complex&amp;limit=9999999" timedOut="10000" X-API-UserId="gdfsgvhdgjfjuhgdyejhgsfegtb" X-API-ProductId="ADS" ApiKey="@gggf-fsffff@"/>
  </server>
  <server type="vfffdg">
    <web-server-parm mode="QA" ServerAddr="http://api-stg.link.com/dataapi/v2/exchangerates/" timedOut="10000" X-API-UserId="gsfsftfdfrfefrferf" X-API-ProductId="ADS" ApiKey="fgvdgggdfgttggefr"/>
    <web-server-parm mode="UAT" ServerAddr="http://api-uat.link.com/dataapi/v2/exchangerates/" timedOut="10000" X-API-UserId="gdfdagtgdfsgtrsdfsg" X-API-ProductId="ADS" ApiKey="@hdvfddfdd"/>
  </server>
</ConfigRoot>

Task.py This is what I have so far

import xml.etree.ElementTree as ET 
# import XML, SubElement, Element, tostring

#----------------------------------------------------------------------
def parseXML(xml_file):
    """
    Parse XML with ElementTree
    """
    tree = ET.ElementTree(file=xml_file)
    root = tree.getroot()

    # get the information via the children!

    print "Iterating using getchildren()"

    node = root.getchildren()
    for server_addr in node:
        node_children = server_addr.getchildren()
        for node_child in node_children:
            print "_________passed__________"
            print "%s=%s" % (node_child.attrib, node_child.text)
            test = node_child.findtext("http://api-stg.link.com/dataapi/v2/exchangerates/")
            if test is None:
                continue
            tests = test.text
            print tests

# #----------------------------------------------------------------------
if __name__ == "__main__":
    parseXML("test/test.xml")

Upvotes: 0

Views: 354

Answers (1)

Parfait
Parfait

Reputation: 107767

Consider using iter() across the elements with a conditional if replace:

import xml.etree.ElementTree as ET 

#----------------------------------------------------------------------
def parseXML(xml_file):
    """
    Parse XML with ElementTree
    """
    tree = ET.ElementTree(file=xml_file)
    root = tree.getroot()

    # get the information via the children!
    print("Iterating using getchildren()")

    for serv in root.iter('server'):
        for web in serv.iter('web-server-parm'):
                if 'http://api-stg.link.com' in web.get('ServerAddr'):
                    web.set('ServerAddr', web.get('ServerAddr').\
                        replace("http://api-stg.link.com", "http://api-DATA-stg.link.com"))

    print(ET.tostring(root).decode("UTF-8"))

    tree.write("ConfigRoot_py.xml")

# #----------------------------------------------------------------------
if __name__ == "__main__":
    parseXML("ConfigRoot.xml")

Output

<ConfigRoot>
  <max-layer layer="5" />
  <enabled-cache status="0" />
  <server type="fgrfreefr">
    <web-server-parm ApiKey="fgggdfvdffdgdfg" ServerAddr="http://api-DATA-stg.link.com/dataapi/v2/securities?response=complex&amp;limit=9999999" X-API-ProductId="ADS" X-API-UserId="54456464561" mode="QA" timedOut="10000" />
    <web-server-parm ApiKey="@gggf-fsffff@" ServerAddr="http://api-uat.link.com/dataapi/v2/securities?response=complex&amp;limit=9999999" X-API-ProductId="ADS" X-API-UserId="gdfsgvhdgjfjuhgdyejhgsfegtb" mode="UAT" timedOut="10000" />
  </server>
  <server type="vfffdg">
    <web-server-parm ApiKey="fgvdgggdfgttggefr" ServerAddr="http://api-DATA-stg.link.com/dataapi/v2/exchangerates/" X-API-ProductId="ADS" X-API-UserId="gsfsftfdfrfefrferf" mode="QA" timedOut="10000" />
    <web-server-parm ApiKey="@hdvfddfdd" ServerAddr="http://api-DATA-stg.link.com/dataapi/v2/exchangerates/" X-API-ProductId="ADS" X-API-UserId="gdfdagtgdfsgtrsdfsg" mode="UAT" timedOut="10000" />
  </server>
</ConfigRoot>

Upvotes: 2

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