code: def _load_env_vars(env_var_names):
      env_var_dict = {k: os.environ.get(k) for k in env_var_names}
      return namedtuple("EnvVars", env_var_names)(**env_var_dict)
  
label_desc: Use image node_id 1 for calling a global function with example usage: _load_env_vars(env_var_names) and returns: namedtuple