1)>You'd need to elaborate on that. I've been using argparse for years and never once had presentational aspects affected by work. So, again, what is the actual use case for this?
  _AttributeHolder_ has sorted the args in `_get_kwargs()` and the offspring class override this function. So you have accepted this default behavior(do not use sorted attributes).
2)some guys have discussed this question in stackoverflow, such as: https://stackoverflow.com/questions/12268602/sort-argparse-help-alphabetically
3)This bpo stay in discussion stage and receive everyone's opinion ;)