title: Convert a dictionary of nested lists to a pandas DataFrame
body: <p>I have a python dictionary as below:</p>
  
  <pre><code>dict1={808: [['a', 5.4, 'b'],
    ['c', 4.1 , 'b'],
    ['d', 3.7 , 'f']]} 
  </code></pre>
  
  <p>I want to convert it into a data frame as below:</p>
  
  <pre><code>memberid  userid score related
  808       a      5.4     b
  808       c      4.1     b
  808       d      3.7     f
  </code></pre>
  
  <p>I tried with code below:</p>
  
  <pre><code>df=pd.DataFrame.from_dict(dict1,orient='index')
  </code></pre>
  
  <p>The results is not what I desired.</p>
  
  <p>Could anybody know how to fix this?
  Thanks!</p>