title: how do i group the values of csv file using panda based on values of row?
body: <p>I have a csv file which has data in this format. Here i want to group by elements using 2 column values.</p>
  <pre><code>col1  col2  col3
  abc   001    mango
  abc   001    apple
  abc   001    orange
  abc   002    potato
  xyz   003    cabbage
  xyz   003    peas
  xyz   004    ladyfinger
  </code></pre>
  <p>I want the output in this format</p>
  <pre><code>col1  col2  col3
  abc   001   [mango,apple,orange]
  abc   002   [potato]
  xyz   003   [cabbage,peas]
  xyz   004   [ladyfinger]
  </code></pre>
  <p>I want to group the values of col3 on basis of clo2 values.</p>