title: Suppose u and v both denote sets in Python. Under what condition can we guarantee that u|v == u^v?
body: <p>I'm stuck in below
   question plz explain it.
  Suppose u and v both denote sets in Python.  Under what condition can we guarantee that u|v == u^v?</p>
  
  <p>I have tried by considering set values as 1,2,3 &amp; 4,5,6.I'm getting answer as v should be subset of u.likewise what should be the correct condition</p>