title: Loading dictionary stored as .npz fails
body: <p>l have a dictionary  store at once as one object using <strong>np.savez</strong> when l open it with <strong>np.load</strong> as follow : </p>
  
  <p>l get the following : </p>
  
  <pre><code>my_dic=np.load('/home/values.npz')
  my_dic.files
  ['scores']
  </code></pre>
  
  <p>However when l try :</p>
  
  <pre><code>my_dic['scores'] # len(my_dic['scores'])=1 but contains 3000 keys and 3000 values
  </code></pre>
  
  <p>it outputs all the keys and values as one object.</p>
  
  <p>Is there any way to access the values and keys  ?</p>
  
  <p>something like :</p>
  
  <pre><code>for k,values in my_dic['scores'].items():
  
      # do something
  </code></pre>
  
  <p>Thank you</p>