Class or Dictionary?
Martin De Kauwe
mdekauwe at gmail.com
Sun Feb 13 18:16:30 EST 2011
On Feb 13, 6:35 pm, Terry Reedy <tjre... at udel.edu> wrote:
> On 2/12/2011 9:20 PM, Martin De Kauwe wrote:
> > On Feb 13, 5:12 am, Terry Reedy<tjre... at udel.edu> wrote:
> >> On 2/12/2011 1:24 AM, Martin De Kauwe wrote:
> >>> The point of this posting was just to ask those that know, whether it
> >>> was a bad idea to use the class object in the way I had or was that
> >>> OK? And if I should have just used a dictionary, why?
> >> Did you miss my suggestion to use a module rather than a class?
> >> Modules do not have some of the disadvantages of classes listed by J. Nagle.
> >> --
> >> Terry Jan Reedy
> > Hi, sorry I did. I just re-read it, could you provide an example?
> I am not sure what you are asking. tkinter.contants is one example.
> > Sorry i am having a major mind blank this morning (I think this is
> > obvious!?). And it would meet all of the criteria outlined by John
> > Nagle?
> A module will work fine if but only if you commit yourself to having all
> keys be legal Python identifiers. But that is usually not a problem with
> configuration values.
> Terry Jan Reedy
I think I got it, did you mean something like this?
radius_of_earth = 6.37122E+6
days_as_yrs = 1.0 / 365.25
m2_as_ha = 1E-4 # metres squared as hectares
g_as_tonnes = 1E-6 # grammes as tonnes
kg_as_tonnes = 1E-3 # kg as tonnes
kg_as_g = 1E+3
self.radius_of_earth = self.__class__.radius_of_earth
self.days_as_yrs = self.__class__.days_as_yrs
self.m2_as_ha = self.__class__.m2_as_ha
self.g_as_tonnes = self.__class__.g_as_tonnes
self.kg_as_tonnes = self.__class__.kg_as_tonnes
self.kg_as_g = self.__class__.kg_as_g
usage something like
>>>from constants import Constants
Something similar for the params?
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