title: Adding values to a list
body: <p>I'm an R newbie and am trying to create a basic "database" for my comic books. 
  However, I have a problem.</p>
  
  <p>The idea is to place each new entry as a list.
  I assumed that I could set up the lists to look like the following.</p>
  
  <pre><code>[Thor, 50, Marvel]
  [Thor, 51, Marvel]
  [Thor, 52, Marvel]
  ...
  eventually, I 'd like to include entries for story arc, writer, artist, etc.
  </code></pre>
  
  <p>However, I'm using the following code to enter in the comics and have found that each new entry is just added to the end of the list.</p>
  
  <pre><code>option = 0
  comicdb = []
  
  while option != 3:
      print "--------------------------"
      print "1. Add a New Comic Book"
      print "2. Print the Database"
      print "3. Quit"
      option = int(raw_input("Pick an Option: "))
      if option == 1:
          title = raw_input("Comic Book Title: ")
          issue = int(raw_input("Issue Number: "))
          publisher = raw_input("Publisher: ")
          comicdb.append(title)
          comicdb.append(issue)
          comicdb.append(publisher)
          print comicdb
  </code></pre>
  
  <p>After running the code a couple times, the list looks like:</p>
  
  <pre><code>['Thor', 50, 'Marvel', 'Thor', 51, 'Marvel', 'Thor', 52, 'Marvel']
  </code></pre>
  
  <p>I'm assuming that one of the following things is wrong, but I can't figure it out:</p>
  
  <ol>
  <li>append is the wrong command to use</li>
  <li>i should use a dictionary or tuple instead of a list</li>
  </ol>
  
  <p>Help!</p>