code: def _get_valid_pathstr(pathstr):
      """Remove disallowed characters from path
  
      Removes:  [][ (){}?:<>#!|"';]
      Replaces: ',' -> '.'
      """
      if not isinstance(pathstr, (str, bytes)):
          pathstr = str(pathstr)
      pathstr = pathstr.replace(os.sep, "..")
      pathstr = re.sub(r"""[][ (){}?:<>#!|"';]""", "", pathstr)
      pathstr = pathstr.replace(",", ".")
      return pathstr
  
imports: import os
  import sys
  import pickle
  from collections import defaultdict
  import re
  from copy import deepcopy
  from glob import glob
  from pathlib import Path
  from traceback import format_exception
  from hashlib import sha1
  from functools import reduce
  import numpy
  from ...None import logging, config
  from ...utils.filemanip import indirectory, relpath, fname_presuffix, ensure_list, get_related_files, save_json, savepkl, loadpkl, write_rst_header, write_rst_dict, write_rst_list
  from ...utils.misc import str2bool
  from ...utils.functions import create_function_from_source
  from ...interfaces.base.traits_extension import rebase_path_traits, resolve_path_traits, OutputMultiPath, isdefined, Undefined
  from ...interfaces.base.support import Bunch, InterfaceResult
  from ...interfaces.base import CommandLine
  from ...interfaces.utility import IdentityInterface
  from ...utils.provenance import ProvStore, pm, nipype_ns, get_id
  from inspect import signature
label_desc: Use image node_id 16 for calling a global function with example usage: _get_valid_pathstr(pathstr) and returns: pathstr