title: How to use Pandas to fetch specific rows?
body: <p>I know pandas can fetch data from head or tail:</p>
  
  <pre><code>data = data.head(100)
  
  data = data.tail(100)
  </code></pre>
  
  <p>what if I want to fetch the data from row 20th to row 30th:</p>
  
  <p>any function like:</p>
  
  <pre><code>data =data.(from row 20th to row 30th)
  </code></pre>
  
  <p>Any friends can help?</p>