On 01/05/2012 07:34 AM, Ryan May wrote:
> On Thu, Jan 5, 2012 at 10:58 AM, Benjamin Root<ben.r...@ou.edu> wrote:
>>
>>
>> On Thu, Jan 5, 2012 at 10:40 AM, Benjamin Root<ben.r...@ou.edu> wrote:
>>>
>>>
>>>> At the very least, it would help in compartmentallizing all the possible
>>>> drawing attributes that are common across all artists. Currently, I am
>>>> envisioning using a defaultdict object (which was introduced in python 2.5)
>>>> or subclassing from it. This might help in keeping compatibility with
>>>> existing code. Subclassing would allow for modifying __get__ and __set__
>>>> to
>>>> treat some elements like 'c' and 'color', 'lw' and 'linewidth' and so on as
>>>> the same.
>>
>>
>> Grrrr, in defaultdict(), the default_factory is called without arguments, so
>> a factory can't be made to produce a default value for a given key, unless I
>> resort to more hackary...
>
> Might be better to explicitly use properties for this rather than
> overriding dict:
>
> class Style(object):
> __slots__ = ('_lw')
>
> def __init__(self, lw=None):
> self.lw = lw
>
> def _set_linewidth(self, lw):
> self._lw = lw
>
> def _get_linewidth(self):
> return self._lw
>
> lw = property(_get_linewidth, _set_linewidth)
> linewidth = property(_get_linewidth, _set_linewidth)
>
> Declaring slots allows you to keep the available attributes to those
> explicity listed. This way, you can't set a random (misspelled?)
> attribute and wonder for hours why style.edgcolor = 'blue' doesn't
> work.
This seems useful, and may be OK for this application; but a little
googling indicates that it is not really what __slots__ was intended
for, it is at best controversial, and it should be used very sparingly
and carefully.
Eric
>
> Ryan
>
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