code: def _compute_one_step(self, t, fields, pars):
          
          fields, pars = self._hook(t, fields, pars)
          self.dt = (self.tmax - t
                     if self.tmax and (t + self.dt >= self.tmax)
                     else self.dt)
          before_compute = time.process_time()
          t, fields = self._scheme(t, fields, self.dt,
                                   pars, hook=self._hook)
          after_compute = time.process_time()
          self._last_running = after_compute - before_compute
          self._total_running += self._last_running
          self._last_timestamp = self._actual_timestamp
          self._actual_timestamp = pendulum.now()
          return t, fields, pars
docs: Compute one step of the simulation, then update the timers.