code: def _postcheck(self, network, feedin):
          
          curtailment = network.timeseries.curtailment
          gen_repr = [repr(_) for _ in curtailment.columns]
          feedin_repr = feedin.loc[:, gen_repr]
          curtailment_repr = curtailment
          curtailment_repr.columns = gen_repr
          if not ((feedin_repr - curtailment_repr) > -1e-1).all().all():
              message = 'Curtailment exceeds feed-in.'
              logging.error(message)
              raise TypeError(message)
docs: Raises an error if the curtailment of a generator exceeds the
          feed-in of that generator at any time step.
  
          Parameters
          -----------
          network : :class:`~.grid.network.Network`
          feedin : :pandas:`pandas.DataFrame<dataframe>`
              DataFrame with feed-in time series in kW. Columns of the dataframe
              are :class:`~.grid.components.GeneratorFluctuating`, index is
              time index.