code: def query_yes_no(question, default=True):
      """Ask a yes/no question via standard input and return the answer.
  
      Source: https://stackoverflow.com/questions/3041986/apt-command-line-interface-like-yes-no-input
  
      If invalid input is given, the user will be asked until they actually give valid input.
  
      Side Effects: Blocks program execution until valid input(y/n) is given.
  
      :param question(str):  A question that is presented to the user.
      :param default(bool|None): The default value when enter is pressed with no value.
          When None, there is no default value and the query will loop.
      :returns: A bool indicating whether user has entered yes or no.
      """
      yes_list = ["yes", "y"]
      no_list = ["no", "n"]
      default_dict = {
          None: "[y/n]",
          True: "[Y/n]",
          False: "[y/N]",
      }  # default => prompt default string
      default_str = default_dict[default]
      prompt_str = "%s %s " % (question, default_str)
      while True:
          choice = input(prompt_str).lower()
          if not choice and default is not None:
              return default
          if choice in yes_list:
              return True
          if choice in no_list:
              return False
          notification_str = "Please respond with 'y' or 'n'"
          print(notification_str)
  
label_desc: Use image node_id 1 for calling a global function with example usage: query_yes_no(question, default) and returns: default, True, False