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