title: Replace values in a series pandas
body: <p>How come when i want to replace a value I have to use this block of code:</p>
  
  <pre><code>data['Organization'].str.replace('Greece','Rome')
  </code></pre>
  
  <p>why cant I use this:</p>
  
  <pre><code>data['Organization'].replace('Greece','Rome').
  </code></pre>
  
  <p>I've seen others use method two before without passing a string method. 
  My question is can i pass a series method using replace function and what is the line of code?</p>