code: def add_column(self, name: str) -> None:
      self._columns[name] = Column([self._fill_value] * len(self))
      self._keys.append(name)
  
imports: from collections import abc
  from itertools import chain, repeat, zip_longest
  from operator import itemgetter
  from typing import TYPE_CHECKING, Any, Dict, ItemsView, Iterable, Iterator, List, Mapping, MutableSequence, Optional, Sequence, Set, Tuple, Union, overload
  from funcy import reraise
label_desc: Use image node_id 27 for calling the TabularData obj's underlying member method code with example usage: obj.add_column(name) without return types