title: How to get the minimum value of a row list in a pandas dataframe
body: <p>I have a pandas dataframe with a column made of <i>lists</i>.<br>
  The goal is to find the min of every list in row (in an efficient way).</p>
  
  <p>E.g.</p>
  
  <pre><code>import pandas as pd
  df = pd.DataFrame(columns=['Lists', 'Min'])
  df['Lists'] = [ [1,2,3], [4,5,6], [7,8,9] ]
  print(df)
  </code></pre>
  
  <p>The goal is the <code>Min</code> column:</p>
  
  <pre><code>       Lists  Min
  0  [1, 2, 3]  1
  1  [4, 5, 6]  4
  2  [7, 8, 9]  7
  </code></pre>
  
  <p>Thank you in advance,<br>
  gil</p>