code: def select_column(self, key, column, **kwargs):
          
          return self.get_storer(key).read_column(column=column, **kwargs)
docs: return a single column from the table. This is generally only useful to
          select an indexable
  
          Parameters
          ----------
          key : object
          column: the column of interest
  
          Exceptions
          ----------
          raises KeyError if the column is not found (or key is not a valid
              store)
          raises ValueError if the column can not be extracted individually (it
              is part of a data block)