On Feb 17, 1:09 pm, Nils Bruin <nbr...@sfu.ca> wrote:
> """
> User-defined classes have __cmp__() and __hash__() methods by default;
> with them, all objects compare unequal (except with themselves) and
> x.__hash__() returns id(x).
> """
The Python documentation is plainly wrong on that one by the way:

sage: A=object()
sage: hash(A)
8781527762730
sage: id(A)
140504444203680
sage: hash(A) << 4 == id (A)
True

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