input: Write a function named `intersection` that takes two sets of integers as input and outputs the intersection of those sets. 
  
  
  def intersection(set1, set2):
      return set1 & set2
  
  set1 = {1, 2, 3, 4}
  set2 = {3, 4, 5, 6}
  
  result = intersection(set1, set2)
  print(result)
  
  
  assert intersection({1, 2, 3, 4}, {3, 4, 5, 6})=={3, 4}
  assert intersection({1, 2, 3}, {4, 5, 6})==set()
  assert intersection({1, 2, 3}, {2, 3, 4})=={2, 3}
  assert intersection(set(), {1, 2, 3})==set()
  assert intersection({1, 2, 3}, set())==set()
output: def intersection(set1, set2):
      return set1 & set2