Python 2.2b1 hashable dictionary bug?

[Rainer Deyke]

"Tim Peters" <tim.one at home.com> wrote in message
news:mailman.1004342908.6096.python-list at python.org...
> [Rainer Deyke]
> > What about this:
> >
> > class dictionary_with_identity_compare(dictionary):
> >   __eq__ = object.__eq__
> >   __ne__ = object.__ne__
> >   __lt__ = object.__lt__
> >   __gt__ = object.__gt__
> >   __le__ = object.__le__
> >   __ge__ = object.__ge__
> >   __hash__ = object.__hash__
> >
> > d = {dictionary_with_identity_compare() : None}
>
> It should suffice to override just __eq__ and __hash__.  However, you
can't
> override __eq__ via object.__eq__:

That's surprising (and therefore probably a bad thing).  My first
expectation was for something like this:

class object:
  def __eq__(self, other):
    return id(self) == id(other)

The problem with that is that it breaks '__cmp__'.  My second expectation
was for something like this:

class object:
  def __cmp__(self, other):
    return cmp(id(self), id(other))
  def __eq__(self, other):
    return self.__cmp__(other) == 0

I see no reason why this has not been included.


--
Rainer Deyke (root at rainerdeyke.com)
Shareware computer games           -           http://rainerdeyke.com
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