frozenset question
Qiangning Hong
hongqn at gmail.com
Wed Jul 6 06:08:08 EDT 2005
On 7/6/05, Will McGugan <news at nowillmcguganspam.com> wrote:
> Hi,
>
> Are there any benefits in using a frozenset over a set, other than it
> being immutable?
A frozenset can be used as a key of a dict:
.>> s1 = set([1])
.>> s2 = frozenset([2])
.>> {s1: 1}
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: set objects are unhashable
.>> {s2:1}
{frozenset([2]): 1}
--
Qiangning Hong
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