title: python pandas dataframe columns convert to dict key and value
body: <p>I have a pandas data frame with multiple columns and I would like to construct a dict from two columns: one as the dict's keys and the other as the dict's values. How can I do that?</p>
  
  <p>Dataframe:</p>
  
  <pre><code>           area  count
  co tp
  DE Lake      10      7
  Forest       20      5
  FR Lake      30      2
  Forest       40      3
  </code></pre>
  
  <p>I need to define area as key, count as value in dict. Thank you in advance.</p>