title: how to remove empty series from list in Python
body: <p>I have a list which looks something like this.</p>
  
  <pre><code>DB
  Out[469]: 
  [[3    523
  Name: order_id, dtype: object], 0    [526, 533]
  Name: order_id, dtype: object, Series([], Name: order_id, dtype: object)]
  </code></pre>
  
  <p>And what I want it to look like this. </p>
  
  <pre><code>DB
  [['523',['526','533']]]
  </code></pre>
  
  <p>I am doing following in python</p>
  
  <pre><code> DB[0][0].values[0]
   Out[462]: '523'
  
   DB[1][0]
   Out[463]: ['526', '533']
  </code></pre>
  
  <p>And to remove empty series </p>
  
  <pre><code> [x for x in DB if x != []]   
  </code></pre>
  
  <p>But It doesn't work. I want a for loop which will iterate through <code>DB</code> and give me final output. Please help.</p>