title: Test if two lists are equal
body: <p>I'm trying to write tests for my Django app and I need to check many times
  if 2 lists have the same objects (i.e. that every object in A is also in B and vice versa).</p>
  
  <p>I read on the assertLists/Sequence/Equal etc but for what I saw if the lists 
  have the same objects but in a different order <code>(A = [a,b,c], B = [b,c,a])</code> then it returns an error, which I don't want it to be an error because they both have the same objects. </p>
  
  <p>Is there a way to check this without looping the lists?</p>