class_docstr: Helper methods for Airflow Handler.
class_docstr_tok: ["Helper","methods","for","Airflow","Handler","."]
code: def _get_airflow_version(self):
      return subprocess.check_output(
          ["airflow", "version"], encoding="utf-8"
      ).rstrip()
  
imports: import json
  import os
  import subprocess
  from typing import Any, Dict, List
  import click
  from tfx.dsl.io import fileio
  from tfx.tools.cli import labels
  from tfx.tools.cli.handler import airflow_dag_runner_patcher
  from tfx.tools.cli.handler import base_handler
  from tfx.utils import io_utils
label_desc: Use image node_id 2 for calling the AirflowHandler obj's underlying member method code with example usage: obj._get_airflow_version() and returns: subprocess