title: Get the first 100 elements of OrderedDict
body: <p><code>preresult</code> is an <code>OrderedDict()</code>.</p>
  
  <p>I want to save the first 100 elements in it. Or keep <code>preresult</code> but delete everything other than the first 100 elements.</p>
  
  <p>The structure is like this</p>
  
  <pre><code>stats = {'a':   {'email1':4, 'email2':3}, 
           'the': {'email1':2, 'email3':4},
           'or':  {'email1':2, 'email3':1}}
  </code></pre>
  
  <p>Will islice work for it？ Mine tells <code>itertool.islice</code> does not have <code>items</code></p>