code: def TLV_GET(attrs, attrNum, format):
      
      attrView = attrs[attrNum]
      if format == 's':
          format = str(attrView.len) + format
      try:
          (result,) = struct.unpack_from(format, attrView.buf, attrView.offset)
      except TypeError:
          # Working around struct.unpack_from issue #10212
          (result,) = struct.unpack_from(format, str(bytearray(attrView.buf)), attrView.offset)
      return result
docs: Get a tag-length-value encoded attribute.