title: Count distinct words from a Pandas Data Frame
body: <p>I've a Pandas data frame, where one column contains text. I'd like to get a list of unique words appearing across the entire column (space being the only split).</p>
  
  <pre><code>import pandas as pd
  
  r1=['My nickname is ft.jgt','Someone is going to my place']
  
  df=pd.DataFrame(r1,columns=['text'])
  </code></pre>
  
  <p>The output should look like this:</p>
  
  <pre><code>['my','nickname','is','ft.jgt','someone','going','to','place']
  </code></pre>
  
  <p>It wouldn't hurt to get a count as well, but it is not required.</p>