title: How to rearrange a python pandas dataframe?
body: <p>I have the following dataframe read in from a .csv file with the "Date" column being the index. The days are in the rows and the columns show the values for the hours that day.</p>
  
  <pre><code>&gt; Date           h1 h2  h3  h4 ... h24
  &gt; 14.03.2013    60  50  52  49 ... 73
  </code></pre>
  
  <p>I would like to arrange it like this, so that there is one index column with the date/time and one column with the values in a sequence</p>
  
  <pre><code>&gt;Date/Time            Value
  &gt;14.03.2013 00:00:00  60
  &gt;14.03.2013 01:00:00  50
  &gt;14.03.2013 02:00:00  52
  &gt;14.03.2013 03:00:00  49
  &gt;.
  &gt;.
  &gt;.
  &gt;14.03.2013 23:00:00  73
  </code></pre>
  
  <p>I was trying it by using two loops to go through the dataframe.
  Is there an easier way to do this in pandas?</p>