title: Simple for loop over nodes in NetworkX
body: <p>I have a network (twitter_handles) containing tree twitter handles as nodes, I'd like to loop over the nodes to print each node one at the time</p>
  
  <pre><code>for node in twitter_handles.nodes():
      print(twitter_handles.node())
  </code></pre>
  
  <p>which I would expect to give me:</p>
  
  <pre><code>'twitterHandle1'
  'twitterHandle2'
  'twitterHandle3'
  </code></pre>
  
  <p>But this doesn't work. I've tried with nodes_iter() but that prints out 3x <code>dict_keyiterator object at 0x10c432d18</code>. Any ideas?</p>