code: def _save_header(self) -> None:
      if not self.has_mi_columns or self._has_aliases:
          self.writer.writerow(self.encoded_labels)
      else:
          for row in self._generate_multiindex_header_rows():
              self.writer.writerow(row)
  
imports: from __future__ import annotations
  import csv
  import os
  from typing import TYPE_CHECKING, Any, Hashable, Iterator, Sequence, cast
  import numpy
  from pandas._libs import writers
  from pandas._typing import CompressionOptions, FilePath, FloatFormatType, IndexLabel, StorageOptions, WriteBuffer
  from pandas.util._decorators import cache_readonly
  from pandas.core.dtypes.generic import ABCDatetimeIndex, ABCIndex, ABCMultiIndex, ABCPeriodIndex
  from pandas.core.dtypes.missing import notna
  from pandas.core.indexes.api import Index
  from pandas.io.common import get_handle
label_desc: Use image node_id 24 for calling the CSVFormatter obj's underlying member method code with example usage: obj._save_header() without return types