Python built-in functions (24) -- frozenset, pythonfrozenset

Python built-in functions (24) -- frozenset, pythonfrozenset

English document:

Class frozenset([ Iterable])

Return a new frozensetObject, optionally with elements taken from Iterable. frozensetIs a built-in class. See frozensetAnd Set Types-set, frozenset for documentation about this class.

For other containers see the built-in set, list, tuple, And dictClasses, as well as collectionsModule.

Note:

　　

1. Input an iteratable object to generate a new immutable set.

>>> a = frozenset(range(10))>>> afrozenset({0, 1, 2, 3, 4, 5, 6, 7, 8, 9})>>> b = frozenset('I am a Pythoner')>>> bfrozenset({'y', 'I', ' ', 'r', 't', 'm', 'h', 'o', 'a', 'e', 'n', 'P'})

2. When no parameter is input, an empty immutable set is generated.

>>> c = frozenset()>>> cfrozenset()