title: Day of week constants with Sunday = 0 in Python
body: <p>The calendar module has day of week constants beginning with </p>
  
  <pre><code>calendar.MONDAY
  Out[60]: 0
  </code></pre>
  
  <p>However, sometimes one must interface with a system (perhaps written in JavaScript) that uses the convention Sunday = 0. Does Python provide such constants?</p>