parser.py 文件源码

def add_argument(self, action):
        if action.help is not argparse.SUPPRESS:

            # find all invocations
            get_invocation = self._format_action_invocation
            invocations = [get_invocation(action)]
            current_indent = self._current_indent
            for subaction in self._iter_indented_subactions(action):
                # compensate for the indent that will be added
                indent_chg = self._current_indent - current_indent
                added_indent = 'x'*indent_chg
                invocations.append(added_indent+get_invocation(subaction))
            # print('inv', invocations)

            # update the maximum item length
            invocation_length = max([len(s) for s in invocations])
            action_length = invocation_length + self._current_indent
            self._action_max_length = max(self._action_max_length,
                                          action_length)

            # add the item to the list
            self._add_item(self._format_action, [action])