code: def apply_necessary_remediation(
      df: OptionalDataFrameT, remediation: Remediation
  ) -> OptionalDataFrameT:
      """
      This function will apply a necessary remediation to a dataframe, or print an error message if one exists.
      """
      if remediation.error_msg is not None:
          sys.stderr.write(
              f"\n\nERROR in {remediation.name} validator: {remediation.error_msg}\n\nAborting..."
          )
          sys.exit(1)
      if remediation.immediate_msg is not None:
          sys.stdout.write(remediation.immediate_msg)
      if remediation.necessary_fn is not None:
          df = remediation.necessary_fn(df)
      return df
  
imports: from __future__ import annotations
  import os
  import sys
  from typing import Any, TypeVar, Callable, Optional, NamedTuple
  from typing_extensions import TypeAlias
  from .._extras import pandas
label_desc: Use image node_id 15 for calling a global function with example usage: apply_necessary_remediation(df, remediation) and returns: df