code: def yield_all_dir_path(dir_abspath):
          
          if os.path.isdir(dir_abspath):
              for current_folder, folderlist, _ in os.walk(dir_abspath):
                  for folder in folderlist:
                      yield os.path.join(current_folder, folder)
          else:
              raise Exception(
                  "'%s' may not exists or is not a directory!" % dir_abspath)
docs: **中文文档**
          
          遍历dir_abspath目录下的所有子目录, 返回绝对路径。