#!/usr/bin/python3
# -*- coding: utf-8 -*-
"""
A frozen set is just a set, but immutable:

list (mutable) is to tuple (immutable)
as
set (mutable) is to frozenset (immutable)
"""
from typing import Set, FrozenSet

help(frozenset)

pointlessfrozenset = frozenset()

filled_set: Set[int] = {1, 1, 3, 5, 5, 5, 7}
my_frozen_set: FrozenSet[int] = frozenset(filled_set)

print("Type: my_frozen_set.add(8)")
# my_frozen_set.add(8)
# AttributeError: 'frozenset' object has no attribute 'add'

# Despite what you might guess, given the syntax,
# This is not a set, or a frozenset,
# but instead our next data structure, the dictionary:
y = {}
print(type(y))