input: Write a function to return the intersection of two sets of integers. The function should take two sets as parameters and return a new set containing the elements that are present in both input sets.
  
  def intersection(set1, set2): 
     return set1 & set2
  
  assert intersection({1, 2, 3, 4}, {3, 4, 5, 6}) == {3, 4}
  assert intersection({5, 6, 7, 8}, {1, 2, 3, 4}) == set()
  assert intersection({1, 2, 3}, {2, 3, 4, 5}) == {2, 3}
  assert intersection(set(), {1, 2, 3}) == set()
  assert intersection({1, 2, 3}, set()) == set()
output: def intersection(set1, set2): 
     return set1 & set2