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Date: Tue, 6 Dec 2011 21:24:42 -0800 (PST)
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Subject: Re: order independent hash?
From: 88888 Dihedral <dihedral88888@googlemail.com>
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On Monday, December 5, 2011 7:24:49 AM UTC+8, Ian wrote:
> On Sun, Dec 4, 2011 at 4:17 PM, 88888 Dihedral
> <dihedr...@googlemail.com> wrote:
> >> Please explain what you think a hash function is, then. =A0Per
> >> Wikipedia, "A hash function is any algorithm or subroutine that maps
> >> large data sets to smaller data sets, called keys."
> >>
> >> > Are you miss-leading the power of true OOP ?
> >>
> >> I have no idea what you are suggesting. =A0I was not talking about OOP=
 at all.
> >
> > In python the (k,v) pair in a dictionary k and v can be =A0both an obje=
cts.
> > v can be a tuple or a list. =A0There are some restrictions on k to be a=
n
> > =A0hashable type in python's implementation. The key is used to compute=
 the position of the pair to be stored in a =A0hash table. The hash functio=
n maps key k to the position in the hash table. If k1!=3Dk2 are both =A0map=
ped to the same
> > position, then something has to be done to resolve this.
>=20
> I understand how dicts / hash tables work.  I don't need you to
> explain that to me.  What you haven't explained is why you stated that
> a hash function that operates on objects is not a hash function, or
> what you meant by "misleading the power of true OOP".

Do you  forget the memory management of a dictionary in Python that has=20
to be linked for a dynamical growing and shrinking number of (k,v) pairs=20
in a long period of time?

Avoiding the true non-trivial part in any implementation or use of a dictio=
nary  is miss leading ?=20

Probing too deep in the stack or occupying too much in the heap is not
bug free?