title: pandas df locate keep only first item
body: <p>i want to get the value of another column based on a value in a certain column, in the same row. </p>
  
  <p>example:</p>
  
  <p>for business id = '123', i want to retrieve the business_name</p>
  
  <p>df:</p>
  
  <pre><code>biz_id  biz_name
  123      chew
  456      bite
  123      chew
  </code></pre>
  
  <p>code:</p>
  
  <pre><code>df['biz_name'].loc[df['biz_id'] == 123]
  </code></pre>
  
  <p>returns me:</p>
  
  <pre><code>chew
  chew
  </code></pre>
  
  <p>how do i get just 1 value of <code>'chew'</code> in string format?</p>