title: How to put the value of dataframe in array form?
body: <p>I have this dataframe:
  <a href="https://i.stack.imgur.com/x38KQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/x38KQ.png" alt="enter image description here"></a></p>
  
  <p>I wish to have extract all the data for value column in form of array, which the output should be:
  <strong>[nan, 47, 47.9, 48.6]</strong></p>
  
  <p>Anyone can share me the ideas?</p>