[Numpy-discussion] OpenOpt Suite release 0.45

Dmitrey tmp50@ukr....
Sat Mar 16 13:19:26 CDT 2013




--- Исходное сообщение ---
От кого: "Robert Kern" <robert.kern@gmail.com>
Дата: 16 марта 2013, 19:54:51

On Sat, Mar 16, 2013 at 10:39 AM, Matthieu Brucher
<  matthieu.brucher@gmail.com  > wrote:
> Even if they have different hashes, they can be stored in the same
> underlying list before they are retrieved. Then, an actual comparison is
> done to check if the given key (i.e. object instance, not hash) is the same
> as one of the stored keys.

Right. And the rule is that if two objects compare equal, then they
must also hash equal. Unfortunately, it looks like `oofun` objects do
not obey this property. oofun.__eq__() seems to return a Constraint
rather than a bool, so oofun objects should simply not be used as
dictionary keys. 

It is one of several base features FuncDesigner is build on and is used
extremely often and wide; then whole FuncDesigner would work incorrectly
while it is used intensively and solves many problems better than its
competitors.


That's quite possibly the source of the bug. Or at
least, that's a bug that needs to get fixed first before attempting to
debug anything else or attribute bugs to Python or numpy. Also, the
lack of a bool-returning __eq__() will prevent proper sorting, which
also seems to be used in the code snippet that Dmitrey showed.

as I have already mentioned, I ensured via debugger that my __eq__,
__le__ etc are not involved from the buggy place of the code, only
__hash__ is involved from there.


 --
Robert Kern
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