code: def get_async_test_timeout():
      """Get the global timeout setting for async tests.
  
      Returns a float, the timeout in seconds.
  
      .. versionadded:: 3.1
      """
      try:
          return float(os.environ.get("ASYNC_TEST_TIMEOUT"))
      except (ValueError, TypeError):
          return 5
  
imports: from __future__ import absolute_import, division, print_function
  from tornado.log import gen_log, app_log
  from tornado.stack_context import ExceptionStackContext
  from tornado.util import raise_exc_info, basestring_type, PY3
  import functools
  import inspect
  import logging
  import os
  import re
  import signal
  import socket
  import sys
label_desc: Use image node_id 3 for calling a global function with example usage: get_async_test_timeout() and returns: float, int