code: def update(self, pop: Union[pd.DataFrame, pd.Series]):
          
  
          if not pop.empty:
              if isinstance(pop, pd.Series):
                  if pop.name in self._columns:
                      affected_columns = [pop.name]
                  elif len(self._columns) == 1:
                      affected_columns = self._columns
                  else:
                      raise PopulationError('Cannot update with a Series unless the series name equals a column '
                                            'name or there is only a single column in the view')
              else:
                  affected_columns = set(pop.columns)
  
              affected_columns = set(affected_columns).intersection(self._columns)
              state_table = self.manager.get_population(True)
              if not self.manager.growing:
                  affected_columns = set(affected_columns).intersection(state_table.columns)
  
              for c in affected_columns:
                  if c in state_table:
                      v = state_table[c].values
                      if isinstance(pop, pd.Series):
                          v2 = pop.values
                      else:
                          v2 = pop[c].values
                      v[pop.index] = v2
  
                      if v.dtype != v2.dtype:
                          # This happens when the population is being grown because extending
                          # the index forces columns that don't have a natural null type
                          # to become 'object'
                          if not self.manager.growing:
                              raise PopulationError('Component corrupting population table. '
                                                    'Old column type: {} New column type: {}'.format(v.dtype, v2.dtype))
                          v = v.astype(v2.dtype)
                  else:
                      if isinstance(pop, pd.Series):
                          v = pop.values
                      else:
                          v = pop[c].values
                  self.manager._population[c] = v
docs: Update the simulation's state to match ``pop``
  
          Parameters
          ----------
          pop :
                The data which should be copied into the simulation's state. If ``pop`` is a DataFrame only those columns
                included in the view's columns will be used. If ``pop`` is a Series it must have a name that matches
                one of the view's columns unless the view only has one column in which case the Series will be assumed to
                refer to that regardless of its name.