Frozen set is just an immutable version of a Python set object. While elements of a set
can be modified at any time,elements of the frozen set remain the same after creation.
frozenset([iterable])
# tuple of vowels
vowels = ('a', 'e', 'i', 'o', 'u')
fSet = frozenset(vowels)
print('The frozen set is:', fSet) #The frozen set is: frozenset({'a', 'o', 'u', 'i', 'e'})
print('The empty frozen set is:', frozenset()) #The empty frozen set is: frozenset()
# frozensets are immutable
fSet.add('v')