docs: def groups_data(self):
          """All data about all groups (get-only).
  
          :getter: Returns all data about all groups
          :type: list of GroupData
          """
          return _ListProxy(GroupData(num, name, symbol, variant)
                            for (num, name, symbol, variant)
                            in zip(range(self.groups_count),
                                   self.groups_names,
                                   self.groups_symbols,
                                   self.groups_variants))