code: def _fill_empty(df, column_names, value=None):
      """Fill empty function for the case that column_names is list or tuple."""
      fill_mapping = {c: value for c in column_names}
      return df.fillna(value=fill_mapping)
  
file_path: pyjanitor/janitor/functions/fill.py
imports: from collections.abc import Iterable
  from enum import Enum
  from operator import methodcaller
  from typing import Any, Hashable, Iterable, Union
  import pandas
  import pandas_flavor
  from multipledispatch import dispatch
  from janitor.utils import check, check_column, deprecated_alias, refactored_function
label_desc: Use image node_id 4 for calling a global function with example usage: _fill_empty(df, column_names, value) and returns: df