title: Why is the Computer Clock faster than the real clock
body: <p>Using the conventional way of measuring run time, I've done something like the following:</p>
  <pre><code>start = time.time()
  
  #example code
  for _ in range(100000):
     for __ in range(100000):
         print(_)
  
  end = time.time()
  run_time = end-start
  </code></pre>
  <p>I noticed in some cases, the run_time reading would give me 9 seconds. But I was 100% sure it hasn't been 9 seconds long. So I measured with my phone stopwatch. Conservatively speaking, I got 2 seconds on my phone's stopwatch while the program says 4 seconds. (and I have done this multiple times to check it wasn't a false reading) So now I am wondering if the computer's clock works in a different way than our <em>normal</em> clock.</p>