title: Skip missing timestamp when plotting with Matplotlib Python
body: <p>I have a dataset from an experiment that records 10 readings per second, i.e. 600 readings per minute. The data is for 1 month but some dates are missing, I am assuming the reading was turned off on those days.
  When I plot a graph of this reading vs Time using matplotlib, a line is drawn connecting the last available date and next available date.</p>
  
  <p><img src="https://i.stack.imgur.com/HEebP.png" alt="enter image description here"></p>
  
  <p>However, instead of this line, I want a gap to be shown so that it is clear to the viewer that data is unavailable for those days.</p>
  
  <p>I am using Matplotlib and Python 3 to plot.</p>
  
  <p>Here is how the data looks like</p>
  
  <pre><code>timestamp,x
  2019-09-03 18:33:38,17.546
  2019-09-03 18:33:38,17.546
  2019-09-03 18:33:39,17.546
  2019-09-03 18:33:39,17.555999999999997
  2019-09-03 18:33:39,17.589000000000002
  2019-09-03 18:33:39,17.589000000000002
  2019-09-03 18:33:39,17.589000000000002
  2019-09-03 18:33:39,17.589000000000002
  2019-09-03 18:33:39,17.593
  2019-09-03 18:33:39,17.595
  2019-09-03 18:33:40,17.594
  </code></pre>