title: Extract a column's data into a variable
body: <p>I've got a very large dataframe where one of the columns is a dictionary itself. (let's say column 12). In that dictionary is a part of a hyperlink, which I want to get.</p>
  
  <p>In Jupyter, I want to display a table where I have column 0 and 2, as well as the completed hyperlink</p>
  
  <p>I think I need to:</p>
  
  <ul>
  <li>Extract that dictionary from the dataframe</li>
  <li>Get a particular keyed value from it</li>
  <li>Create the full hyperlink from the extracted value</li>
  <li>Copy the dataframe and replace the column with the hyperlink created above</li>
  </ul>
  
  <p>Let's just tackle step 1 and I'll make other questions for the next steps.
  How do I extract values from a dataframe into a variable I can play with?</p>
  
  <pre><code>import pytd
  import pandas
  
  client = pytd.Client(apikey=widget_api_key.value, database=widget_database.value)
  results = client.query(query)
  dataframe = pandas.DataFrame(**results)
  dataframe
  # Not sure what to do next
  </code></pre>