John Machin wrote:
> robert wrote:
>> Dale Strickland-Clark wrote:
>>> Python 2.4.2 (#1, Oct 13 2006, 17:11:24)
>>> [GCC 4.1.0 (SUSE Linux)] on linux2
>>> Type "help", "copyright", "credits" or "license" for more information.
>>>>>> a = object()
>>>>>> a
>>> <object object at 0xb7bbd438>
>>>>>> a.spam = 1
>>> Traceback (most recent call last):
>>> File "<stdin>", line 1, in ?
>>> AttributeError: 'object' object has no attribute 'spam'
>>>>>> class b(object):
>>> ... pass
>>> ...
>>>>>> a = b()
>>>>>> a
>>> <__main__.b object at 0xb7b4dcac>
>>>>>> a.spam = 1
>>>>>>
>>> What is subclassing adding to the class here? Why can't I assign to
>>> attributes of an instance of object?
>>
>> Python sooooo dynamic, but it lacks a (builtin) X-class ready for ad-hoc
>> usage just like dict() :-)
>> I have in almost every app/toolcore-module this one:
>>
>> ------
>>
>> class X(object):
>> def __init__(self,_d={},**kwargs):
>> kwargs.update(_d)
>> self.__dict__=kwargs
>> class Y(X):
>> def __repr__(self):
>> return '<Y:%s>'%self.__dict__
>>
>> ------
>>
>> x=X(spam=1)
>>
>> Maybe X should be renamed to __builtin__.Object ...
>>
>>
>
> Have you considered putting it in one file and *importing* it into
> "almost every app/toolcore-module"?
(yes its in my core python "language extension" module, which I import
frequently in apps)
> Have you considered that others may like to have something a little
> more elaborate, like maybe using the pprint module, or that the amount
> of data that would spew out might in some cases be so great that they
> wouldn't want that every time from repr(), preferring a dump-style
> method that wrote to a logfile?
(in X is no repr so far. of course one could make a default repr with short
output. had no frequent needs so far)
> IMHO that's one of the enormous number of good points about Python; you
> can easily lash up something like that to suit yourself and inject it
> into any class you like; there's no central authority tying your hands
> behind your back.
its more about the general case, trying things out on the interactive etc.
always - thus when I want speed not "suit" :-)
very often I need a dummy object and find me always typing "class X:pass" or
import above tools.
Think this trivial but needed Object() thing is possibly more than a private
sitecustomize-thing. Thats why I wrote here upon seeing others trying object()
which doesn't do what one expects at first.
It wouldn't really tie hands or ? but possibly converse
Robert
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