input: Write a function to calculate the intersection of two sets of integers. The function should take two sets as input and return the intersection of those sets.
  
  def intersection(set1, set2): 
     return set1 & set2
  
  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, 4}, {2, 4})=={2, 4}
  assert intersection({}, {1, 2, 3})==set()
  assert intersection({}, {})==set()
output: def intersection(set1, set2): 
     return set1 & set2