insert unique data in a list

[Steven D'Aprano]

On Sun, 13 Dec 2009 17:19:17 -0800, knifenomad wrote:


> this makes the set type hashable.
> 
> class Set(set):
>     __hash__ = lambda self: id(self)


That's a *seriously* broken hash function.

>>> key = "voila"
>>> d = { Set(key): 1 }
>>> d
{Set(['i', 'a', 'l', 'o', 'v']): 1}
>>> d[ Set(key) ]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
KeyError: Set(['i', 'a', 'l', 'o', 'v'])


-- 
Steven