code: def old(self):
          
          value = getattr(self.fastaccess_old, self.name, None)
          if value is None:
              raise RuntimeError(
                  'No value/values of sequence %s has/have '
                  'not been defined so far.'
                  % objecttools.elementphrase(self))
          else:
              if self.NDIM:
                  value = numpy.asarray(value)
              return value
docs: Assess to the state value(s) at beginning of the time step, which
          has been processed most recently.  When using *HydPy* in the
          normal manner.  But it can be helpful for demonstration and debugging
          purposes.