docstr: Save workbook to disk.
docstr_tok: ["Save","workbook","to","disk","."]
code: def _save(self) -> None:
      """
      Save workbook to disk.
      """
      self.book.close()
  
file_path: pandas/pandas/io/excel/_xlsxwriter.py
imports: from __future__ import annotations
  import json
  from typing import TYPE_CHECKING, Any
  from pandas.io.excel._base import ExcelWriter
  from pandas.io.excel._util import combine_kwargs, validate_freeze_panes
label_desc: Use image node_id 4 for calling the XlsxWriter obj's underlying member method code with example usage: obj._save() without return types