code: def listdir(path, include=r'.', exclude=r'\.pyc$|^\.', show_all=False,
              folders_only=False):
      
      namelist = []
      dirlist = [to_text_string(osp.pardir)]
      for item in os.listdir(to_text_string(path)):
          if re.search(exclude, item) and not show_all:
              continue
          if osp.isdir(osp.join(path, item)):
              dirlist.append(item)
          elif folders_only:
              continue
          elif re.search(include, item) or show_all:
              namelist.append(item)
      return sorted(dirlist, key=str_lower) + \
             sorted(namelist, key=str_lower)
docs: List files and directories