code: def at_most_one(*args) -> bool:
      """
      Return True if at most one of *args is "truthy", and False otherwise.
  
      NOTSET is treated the same as None.
  
      If user supplies an iterable, we raise ValueError and force them to unpack.
      """
  
      def is_set(val):
          if val is NOTSET:
              return False
          else:
              return bool(val)
  
      return sum(map(is_set, args)) in (0, 1)
  
imports: from __future__ import annotations
  import copy
  import itertools
  import re
  import signal
  import warnings
  from datetime import datetime
  from functools import reduce
  from typing import TYPE_CHECKING, Any, Callable, Generator, Iterable, Mapping, MutableMapping, TypeVar, cast
  from lazy_object_proxy import Proxy
  from airflow.configuration import conf
  from airflow.exceptions import AirflowException, RemovedInAirflow3Warning
  from airflow.utils.module_loading import import_string
  from airflow.utils.types import NOTSET
label_desc: Use image node_id 23 for calling a global function with example usage: at_most_one() and returns: unknown, False, bool