title: Print elegantly in scientific notation python
body: <p>I wanna print a number and its uncertainty in the following way:</p>
  
  <p>x = (4.23 ± 0.01) e3</p>
  
  <p>where the value and its uncertainty are two different variables.</p>
  
  <pre><code>mean = 4230
  uncertainty = 10 
  print("x is %.2e \u00B1 %.2e" % (mean, uncertainty))
  </code></pre>
  
  <p>I want them to be formatted with the same power of the exponential in the scientific notation. what I get is</p>
  
  <pre><code>x is 4.23e+03 ± 1.00e+01
  </code></pre>