title: How do I tell python to NOT print an item in a list?
body: <p>My python script parses titles and links from multiple RSS feeds. I store those Titles in a list and I want to make sure I never print duplicates. How do I do that?</p>
  
  <pre><code>    #!/usr/bin/python
   from twitter import *
   from goose import Goose
   import feedparser
   import time
   from pyshorteners import Shortener
   import pause
   import newspaper
  
   dr = feedparser.parse("http://www.darkreading.com/rss_simple.asp") 
   sm =feedparser.parse("http://www.securitymagazine.com/rss/topic/2654-cyber-tactics.rss")
  
  
  
  dr_posts =["CISO Playbook: Games of War &amp; Cyber Defenses",
           "SWIFT Confirms Cyber Heist At Second Bank; Researchers Tie Malware Code to Sony Hack","The 10 Worst Vulnerabilities of The Last 10 Years",
           "GhostShell Leaks Data From 32 Sites In 'Light Hacktivism' Campaign",
            "OPM Breach: 'Cyber Sprint' Response More Like A Marathon",
          "Survey: Customers Lose Trust In Brands After A Data Breach",
         "Domain Abuse Sinks 'Anchors Of Trust'",
         "The 10 Worst Vulnerabilities of The Last 10 Years",
  ]
  
  sm_posts = ["10 Steps to Building a Better Cybersecurity Plan"]
  
  x = 1
  
  while True:
  
      try:
  
          drtitle = dr.entries[x]["title"]
          drlink = dr.entries[x]["link"]
          if drtitle in dr_posts:
              x += 1
              drtitle = dr.entries[x]["title"]
              drtitle = dr.entries[x]["link"]
              print drtitle + "\n" + drlink
              dr_posts.append(drtitle)
              x -= 1
              pause.seconds(10)
          else:
              print drtitle + "\n" + drlink
              dr_posts.append(drtitle)
              pause.seconds(10)
  
          smtitle = sm.entries[x]["title"]
          smlink = sm.entries[x]["link"]
          if smtitle in sm_posts:
              x +=1
              smtitle = sm.entries[x]["title"]
              smtitle = sm.entries[x]["title"]
              print smtitle + "\n" + smlink
              sm_posts.append(smtitle)
              pause.seconds(10)
      else:
          print smtitle + "\n" + smlink
          sm_posts.append(smtitle)
          x+=1
          pause.seconds(10)
  
  
  
  except IndexError:
      print "FAILURE"
      break
  </code></pre>
  
  <p>For the time being I only have it skipping entries. Which would be a problem because if there's another duplicate further down the line in the RSS feed, then I'll have even more duplicates.</p>