title: first and last value of a Day in Pandas (Python)
body: <p>I have a long period of data (3 Month), which was logged every 15 seconds.</p>
  
  <p>The first Timestamp looks like this: 2017-04-01 00:00:00
  The lastTimestamp looks like this: 2017-04-01 23:59:45</p>
  
  <p>Now i am looking for a way to get the first and the last value of the column "Temp".
  It would be nice to have this two values in two new columns.</p>