title: how to convert series of lists into dataframe in python?
body: <p>I have below format of dataframe</p>
  
  <pre><code>student   marks
  a         [12,12,34]
  b         [34,35]
  c         [23,45,23]
  </code></pre>
  
  <p>i want it to convert to like below</p>
  
  <pre><code>student marks_1  marks_2 marks_3
  a       12        12      34
  b       34        35      Nan
  c       23        45      23
  </code></pre>
  
  <p>how to achieve this ? any help please</p>