On Thu, Jan 5, 2012 at 2:59 PM, Daniel Hyams <dhy...@gmail.com> wrote:
> Right, __slots__ is definitely not a good idea to use except in very
> specific situations. I would strongly recommend against its usage here.
>
> http://groups.google.com/group/comp.lang.python/msg/0f2e859b9c002b28
I see that now. I had seen __slots__ used in a namedtuple example (in
the Python docs) and assumed it was a good idea. The same idea could
be achieved by using an internal _fields list and overriding
__getattr__ if the fixed list of attributes was deemed a useful
feature.
Ryan
>
>
>
> On Thu, Jan 5, 2012 at 3:50 PM, Eric Firing <efir...@hawaii.edu> wrote:
>>
>> 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
>> >
>>
>>
>>
>> ------------------------------------------------------------------------------
>> Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex
>> infrastructure or vast IT resources to deliver seamless, secure access to
>> virtual desktops. With this all-in-one solution, easily deploy virtual
>> desktops for less than the cost of PCs and save 60% on VDI infrastructure
>> costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox
>> _______________________________________________
>> Matplotlib-users mailing list
>> Matplotlib-users@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>
>
>
> --
> Daniel Hyams
> dhy...@gmail.com
>
> ------------------------------------------------------------------------------
> Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex
> infrastructure or vast IT resources to deliver seamless, secure access to
> virtual desktops. With this all-in-one solution, easily deploy virtual
> desktops for less than the cost of PCs and save 60% on VDI infrastructure
> costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox
> _______________________________________________
> Matplotlib-users mailing list
> Matplotlib-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
--
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma
------------------------------------------------------------------------------
Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex
infrastructure or vast IT resources to deliver seamless, secure access to
virtual desktops. With this all-in-one solution, easily deploy virtual
desktops for less than the cost of PCs and save 60% on VDI infrastructure
costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox
_______________________________________________
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-users
