[Numpy-discussion] question about optimizing

Robert Kern robert.kern@gmail....
Sat May 17 15:36:20 CDT 2008


On Sat, May 17, 2008 at 3:33 PM, Charles R Harris
<charlesr.harris@gmail.com> wrote:
>
> On Sat, May 17, 2008 at 2:25 PM, Robert Kern <robert.kern@gmail.com> wrote:
>>
>> On Sat, May 17, 2008 at 3:18 PM, Charles R Harris
>> <charlesr.harris@gmail.com> wrote:
>> > Base classes also tend to have limited functionality that will be common
>> > to
>> > all derived types. The object type in Python has only a few methods and
>> > attributes:
>> >
>> > In [4]: dir(object)
>> > Out[4]:
>> > ['__class__',
>> >  '__delattr__',
>> >  '__doc__',
>> >  '__getattribute__',
>> >  '__hash__',
>> >  '__init__',
>> >  '__new__',
>> >  '__reduce__',
>> >  '__reduce_ex__',
>> >  '__repr__',
>> >  '__setattr__',
>> >  '__str__']
>> >
>> > And overloading any of these is likely to cause trouble.
>>
>> Nonsense. *Most* of those are intended to be overloaded. Especially on
>> object.
>
> My bad. What I should have said is, if you change the semantics of these
> methods and attributes, then things will go wrong. The Python documentation
> says as much. For instance, if __new__  returns the time of day. So my point
> would be: those things intended to be overloading are well defined and what
> they do is part of the contract.

Gotcha.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless
enigma that is made terrible by our own mad attempt to interpret it as
though it had an underlying truth."
 -- Umberto Eco


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