code: def _arg2opt(arg):
      '''
      Turn a pass argument into the correct option
      '''
      res = [o for o, a in option_toggles.items() if a == arg]
      res += [o for o, a in option_flags.items() if a == arg]
      return res[0] if res else Nonf _arg2opt(arg):
      '''
      Turn a pass argument into the correct option
      '''
      res = [o for o, a in option_toggles.items() if a == arg]
      res += [o for o, a in option_flags.items() if a == arg]
      return res[0] if res else None
docs: Turn a pass argument into the correct option