code: def yield_all_file_path(dir_abspath):
          
          if os.path.isdir(dir_abspath):
              dir_abspath = os.path.abspath(dir_abspath)
              for current_folder, _, fnamelist in os.walk(dir_abspath):
                  for fname in fnamelist:
                      yield os.path.join(current_folder, fname)
          else:
              raise FileNotFoundError(
                  "'%s' may not exists or is not a directory!" % dir_abspath)
docs: **中文文档**
          
          遍历path目录下的所有文件, 返回绝对路径。