Class or Dictionary?
Terry Reedy
tjreedy at udel.edu
Mon Feb 14 02:02:05 CET 2011
On 2/13/2011 6:16 PM, Martin De Kauwe wrote:
> I think I got it, did you mean something like this?
>
>
> class Constants:
>
> 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
>
> def __init__(self):
>
> 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
>>>> Constants.kg_as_g
>>>> 1000.0
No, simpler. No class statememt necessarily needed.
module constants
----------------
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
# could also have code to load stuff from other files
usage
=====
>>> import constants
>>> constants.kg_as_g
1000.0
Real example
>>> import math
>>> math.pi, math.e
(3.141592653589793, 2.718281828459045)
--
Terry Jan Reedy
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