title: How to sum values of particular rows in pandas?
body: <p>I am not much familiar with Python yet. I have a pandas data frame that looks like this:</p>
  
  <pre><code>          0         1     2     3
  55   Alice   12896399     8    45
  45   Bob     16891982     0     0
  90   Cybill   1800407     1     1
  05   Alice   12896399   100   200
  33   Bob     16891982   0.5     0
  42   Bob     16891982  -1.5  -0.5
  46   Bob     16891982     1     0
  99   Cybill   1800407  0.00  0.00
  </code></pre>
  
  <p>How can i sum the values of columns 2 and 3 to get a result for each person? Like this:</p>
  
  <pre><code>   Alice     108    245
     Bob       0     -0.5
     Cybill    1     1
  </code></pre>
  
  <p>Thank you in advance for your reply.</p>