code: def allocate_series_dataframes(network, series):
      
  
      for component, attributes in iteritems(series):
  
          df = network.df(component)
          pnl = network.pnl(component)
  
          for attr in attributes:
              pnl[attr] = pnl[attr].reindex(columns=df.index,
                                            fill_value=network.components[component]["attrs"].at[attr,"default"])
docs: Populate time-varying outputs with default values.
  
      Parameters
      ----------
      network : pypsa.Network
      series : dict
          Dictionary of components and their attributes to populate (see example)
  
      Returns
      -------
      None
  
      Examples
      --------
      >>> allocate_series_dataframes(network, {'Generator': ['p'],
                                               'Load': ['p']})