# Sets revisited in  python

def union(list1, list2):
  result = list(set(list1 + list2))
  print("Union of {} and {} is {}".format(list1, list2, result))

def intersect(list1, list2):
  result = [x for x in list1 if x in list2]
  print("Intersection of {} and {} is {}".format(list1, list2, result))

def difference(list1, list2):
  result = [x for x in list1 if x not in list2]
  print("Difference of {} and {} is {}".format(list1, list2, result))

def cross_product(list1, list2):
  result = [(x * y) for x in list1 for y in list2]
  print("Cross product of {} and {} is {}".format(list1, list2, result))

def equality(list1, list2):
  result = list1 == list2
  print("Equality of {} and {} is {}".format(list1, list2, result))

def subset(list1, list2):
  result = set(list1) < set(list2)
  print("Subset of {} and {} is {}".format(list1, list2, result))

def proper_subset(list1, list2):
  result = set(list1) < set(list2) and list1 != list2
  print("Proper subset of {} and {} is {}".format(list1, list2, result))

def complement(list1, list2):
  result = [x for x in list2 if x not in list1]
  print("Complement of {} and {} is {}".format(list1, list2, result))
complement([1,2,3,4], [1,4,2,6])