code: def valid_path_append(path, *args):
      """
      Helper to validate passed path directory and append any subsequent
      filename arguments.
  
      Arguments:
          path (str): Initial filesystem path.  Should expand to a valid
                      directory.
          *args (list, optional): Any filename or path suffices to append to path
                                  for returning.
          Returns:
              (list, str): path prepended list of files from args, or path alone if
                       no args specified.
      Raises:
          ValueError: if path is not a valid directory on this filesystem.
      """
      full_path = os.path.expanduser(path)
      res = []
      if not os.path.exists(full_path):
          os.makedirs(full_path)
      if not os.path.isdir(full_path):
          raise ValueError(
              "path: {0} is not a valid directory".format(path)
          )
      for suffix_path in args:
          res.append(os.path.join(full_path, suffix_path))
      if len(res) == 0:
          return path
      if len(res) == 1:
          return res[0]
      return res
  
imports: import argparse
  import gzip
  import io
  import json
  import os
  import posixpath
  import re
  import sys
  import zipfile
  from os import PathLike, makedirs
  from pathlib import Path
  from urllib.parse import urlparse
  import requests
  from tqdm import tqdm
  from nlp_architect.utils.generic import license_prompt
label_desc: Use image node_id 12 for calling a global function with example usage: valid_path_append(path) and returns: res, path, res