how to deal with key-value style tags in xml with python

I've an xml like this:

<?xml version="1.0" encoding="UTF-8"?>
<Environment
     xmlns="http://ift.tt/1i5eaII"
     xmlns:xsi="http://ift.tt/ra1lAU"
     xmlns:oe="http://ift.tt/1i5eaII"
     xmlns:ve="http://ift.tt/1fsAPiH"
     oe:id=""
     ve:vCenterId="vm-61">
   <PlatformSection>
      <Kind>VMware ESXi</Kind>
      <Version>5.5.0</Version>
      <Vendor>VMware, Inc.</Vendor>
      <Locale>en</Locale>
   </PlatformSection>
   <PropertySection>
         <Property oe:key="ppEnv" oe:value="production"/>
         <Property oe:key="pphostname" oe:value="coolhostname"/>
   </PropertySection>
   <ve:EthernetAdapterSection>
      <ve:Adapter ve:mac="00:50:56:94:9a:56" ve:network="Service" ve:unitNumber="7"/>
   </ve:EthernetAdapterSection>
</Environment>

I'd like to get value of oe:key "pphostname" but I couldnt get a clear way of it.