title: Python: Download/parse *Solely* the pubdate tag of rss entry
body: <p>how do I download only the specific attribute of a metadata of an rss? I'm using the universal feedparser library</p>
  
  <p>feedparser.parse(linkstr).entries[0].published</p>
  
  <p>I have this line, which returns something like this if printed: "Sat, 02 Dec 2017 07:00:34 Z"</p>
  
  <p>My question is, does the line download the entire feed and then post only the pubdate of the first entry? Or does it download only the pubdate?</p>
  
  <p>If the former, how can I download only the specific attribute? This is for a bot that runs a check every five minutes, so downloading an entire feed every five minutes will just be unfeasible and horribly inefficient</p>