title: Python Find distance between two coordinates
body: <p>I'm working with a range of 0 to 255.  </p>
  
  <p>My data would be a set of numbers within this range. </p>
  
  <p>Except I need the difference between</p>
  
  <pre><code>255 &amp; 0 = 1
  254 &amp; 5 = 7
  </code></pre>
  
  <p>So in a sense this range is a circular set, and 255 and 0 are the pole.  </p>
  
  <p>Is there some function / easy way to do this?  Or do I need to take the second half of the range and assign it some value to be calculated against?  i.e. 255 becomes 255 - 254 if it is being compared against [1 - 127.4]</p>