[Python-ideas] Fwd: Extremely weird itertools.permutations

[Tim Peters]

[Oscar Benjamin]
> Will this do?
> d = TransformDict(lambda x: (type(x), x))

No.  In the example I gave, *lists* will be passed as x (it was a list
of lists:  the lists are the elements of the permutations, and they
happen to have internal structure of their own).  So the `type(x)`
there is useless (it will always be the list type), while the lists
themselves would still be compared by operator.__eq__.

Not to mention that the constructed tuple isn't hashable anyway (x is
a list), so can't be used by TransformDict.

So that idea doesn't work several times over ;-)