XML : Modify xml using python

I have an xml file already generated by python and it looks like this. It has multiple items.

xml_screenshot

  <?xml version="1.0" encoding="utf-8"?>  <rss version="2.0" xmlns:sparkle="http://www.andymatuschak.org/xml-namespaces/sparkle"  xmlns:dc="http://purl.org/dc/elements/1.1/">  <channel>      <title>title-name-xyz</title>      <link>http://dist.stage.xyzgauri.com/qa/partner/mac.xml</link>      <description>Most recent changes</description>      <language>en</language>    <item>  <title>Version 3.0.22.4</title>  <sparkle:releaseNotesLink>      https://dist.stage.xyzgauri.com.com/qa/partner/mac_notes.html  </sparkle:releaseNotesLink>  <pubDate>Thu, 12 Nov 2015 04:38:23 -0000</pubDate>  <enclosure      url="https://dist.stage.xyzgauri.com/qa/sandisk/InstallCloud.3.0.22.4.pkg"      sparkle:version="3.0.22.4"      sparkle:shortVersionString="3.0.22"      openlength="30455215"      type="application/octet-stream"      sparkle:dsaSignature="MCwCFHvf7peesvwR0AhRbZxTViLarxcjfd758mHPbnOW6wA=="      sparkle:status="live"  />    

  <item>  <title>Version 3.0.10.4</title>  <sparkle:releaseNotesLink>      http://dist.stage.xyzgauri.com/qa/partner/mac_notes.html  </sparkle:releaseNotesLink>  <pubDate>Tue, 03 Nov 2015 04:31:18 -0000</pubDate>  <enclosure      url="http://dist.stage.xyzgauri.com/qa/partner/InstallCloud.3.0.10.4.pkg"      sparkle:version="3.0.10.4"      sparkle:shortVersionString="3.0.10"      openlength="29709636"      type="application/octet-stream"      sparkle:dsaSignature="MCwCFDPvLPr7lYkrx5L5XCDbhXYqrFkGzLtLePK6ng=="      sparkle:status="live"  />    

I need to use python to change the sparkle:status from "live" to "expired" for the older version 3.0.10.4. This xml is later pushed to S3. I am a newbie to python and hence wondering how to implement this. I can even create a whole new jenkins jobs to get this xml and modify it and then push to S3. Any help is appreciated. Thanks.