code: def get_sum_fluxes(self):
          
          fluxes = self.sequences.fluxes
          for flux in fluxes.numerics:
              flux(getattr(fluxes.fastaccess, '_%s_sum' % flux.name))
docs: Get the sum of the fluxes calculated so far.
  
          >>> from hydpy.models.test_v1 import *
          >>> parameterstep()
          >>> fluxes.q = 0.0
          >>> fluxes.fastaccess._q_sum = 1.0
          >>> model.get_sum_fluxes()
          >>> fluxes.q
          q(1.0)