On Feb 14, 12:02 pm, Terry Reedy <tjre...@udel.edu> wrote: > 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
Cool! Thanks this seems straight forward, however if I do it this way then once I change it (i.e. after reading user param file) I can't pass the changed version to another module can i? Or am I being stupid? Unless I do it my way I think import cons >>>print cons.kg_as_g >>>1000.0 >>>cons.kg_as_g = 23.4 >>>print cons.kg_as_g is fine. But if I call import cons in another module it would be back to 1000. right? Whereas if I do it as a class I can pass the adjusted instance? E.g. from constants import Constants c = Constants() I can then change "c" and pass this around? Apologies if I have got that totally wrong! -- http://mail.python.org/mailman/listinfo/python-list
