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.

Ryan

-- 
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma

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