Re: [Python-ideas] Implement `itertools.permutations.__getitem__` and `itertools.permutations.index`

On Mon, Nov 17, 2014 at 09:57:55PM +0200, Ram Rachum wrote:

Ah, I understand. I don't like it, though I'm not sure I can really express why. One reason is that this would mean that PermSpaces would be mutable, and thus not hashable and not usable as keys in dicts and sets.

I'm having trouble thinking of any reason to use a PermSpace as a dict key or set element. Do you have a concrete example of doing so? -- Steven