# -*- coding: utf-8 -*-
# Copyright (c) 2018, Silvio Peroni <essepuntato@gmail.com>
#
# Permission to use, copy, modify, and/or distribute this software for any purpose
# with or without fee is hereby granted, provided that the above copyright notice
# and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
# FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT,
# OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
# DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
# SOFTWARE.


my_first_set = set()  # this creates a new set

my_first_set.add(34)  # these two lines add two numbers
my_first_set.add(15)  # to the set without any particular order
# currently my_first_set contains two elements:
# set({ 34, 15 })

my_first_set.set("Silvio")  # a set can contains element of any kind
# now my_first_set contains:
# set({34, 15, "Silvio"})

my_first_set.remove(34)  # it removes the number 34
# my_first_set became:
# set({15, "Silvio"})

# it doesn't add the new elements since they are already included
my_first_set.update(my_first_set)
# current status of my_first_set:
# set({15, "Silvio"})

my_first_set_len = len(my_first_set) # it stores 2 in my_first_set_len