title: How do I merge different columns in jupyter?
body: <p>I have a Pandas dataframe that contains 6 columns</p>
  
  <pre><code>        Jaar   Maand   Dag   Uur   Minuut      R10
  0       2003       1     1     0        0  0.00000
  1       2003       1     1     0       15  0.00000
  2       2003       1     1     0       30  0.00000
  3       2003       1     1     0       45  0.00000
  </code></pre>
  
  <p>but I would like to have a different format for my data, like in </p>
  
  <pre><code>        Year-Month-Day  Hour:Minute      R10
  0           2003-01-01        00:00  0.00000
  ...                ...          ...      ...
  </code></pre>
  
  <p>How can I make from the different columns 3 columns? One for the Year-Month-day, one for the time and one for R10? With python.</p>