title: How to convert a column of timestamps HH:MM:SS.xxxxxxx to milliseconds?
body: <p>I have been trying to figure out how to do this in Python for the better part of a week, but not been able to find anyone to specifically answer this question. I have a log file, where every line is a timestamp with an event, as such:</p>
  
  <pre><code>HH:MM:SS.xxxxxxx   \t    Event
  HH:MM:SS.xxxxxxx   \t    Event
  HH:MM:SS.xxxxxxx   \t    Event
  ...
  </code></pre>
  
  <p>I have managed to put all this into a list, and figured out how to manipulate that list. What I haven't been able to figure out is how to convert the timestamp (which starts at 0 (well, at one second, really, but roughly 0)) into milliseconds (something I can do in Excel). So every timestamp just represents elapsed time, not an actual o'clock. The seven x's at the end make no sense to me at all, so not sure what they are.</p>
  
  <p>Does anyone have a code snippet that I can use to convert this timestamp into milliseconds?</p>