英文文档:
class frozenset
([iterable])
Return a new frozenset
object, optionally with elements taken from iterable. frozenset
is a built-in class. See frozenset
and Set Types — set, frozenset for documentation about this class.
For other containers see the built-in set
, list
, tuple
, and dict
classes, as well as the collections
module.
说明:
1. 传入一个可迭代对象,生成一个新的不可变集合。
>>> a = frozenset(range(10)) >>> a frozenset({0, 1, 2, 3, 4, 5, 6, 7, 8, 9}) >>> b = frozenset('I am a Pythoner') >>> b frozenset({'y', 'I', ' ', 'r', 't', 'm', 'h', 'o', 'a', 'e', 'n', 'P'})
2. 不传入参数时,生成的空的不可变集合。
>>> c = frozenset() >>> c frozenset()
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