code: def to_csv(self) -> str:
      import csv
      from io import StringIO
  
      buff = StringIO()
      writer = csv.writer(buff)
      writer.writerow(self.keys())
  
      for row in self:
          writer.writerow(row)
      return buff.getvalue()
  
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 26 for calling the TabularData obj's underlying member method code with example usage: obj.to_csv() and returns: buff