text: # sets are unordered collection of unique elements
  # meaning there can only be one representative of the same object
  
  my_set=set()
  print(my_set) # returns empty set
  
  # to insert value in set we can use 'variable.add(value)'
  my_set.add(1)
  my_set.add(2)
  print(my_set) # returns {1,2}
  
  # if we try add 2 again, it will not inset in it
  my_set.add(2)
  print(my_set) # returns {1,2}
  
  # there are some difference in printing format in python2 and python3
  