Re: frozenset question

[Qiangning Hong]

On 7/6/05, Will McGugan <[EMAIL PROTECTED]> 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}

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Qiangning Hong
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