code: def data(self, index, role=Qt.DisplayRole):
          
          if not index.isValid():
              return None
  
          if role not in (Qt.DisplayRole, self.SORT_ROLE,  Qt.ForegroundRole):
              return None
  
          row = index.row()
          col = index.column()
          item = self.registry.items[row]
          attrName = self.attrNames[col]
  
          if role == Qt.DisplayRole:
              return str(getattr(item, attrName))
  
          elif role == self.SORT_ROLE:
              # Use the fullName column as a tie-breaker
              return (getattr(item, attrName), item.fullName)
  
          elif role == Qt.ForegroundRole:
              if item.successfullyImported is None:
                  return self.notImportedBrush
              elif item.successfullyImported:
                  return self.regularBrush
              else:
                  return self.errorBrush
          else:
              raise ValueError("Invalid role: {}".format(role))
docs: Returns the data stored under the given role for the item referred to by the index.