Disable/Remove argument in argparse

Question

Is it possible to remove or disable an argument in argparse, such that it does not show in the help? How?

It is easy to add new arguments:

Answer 1

Although hpaulj answer is great, in my case using just parser._remove_action(action) was not removing from the "positional arguments" help the removed action. My workaround was to remove it also from the _action_group

def remove_option(parser, arg):
    for action in parser._actions:
        if (vars(action)['option_strings']
            and vars(action)['option_strings'][0] == arg) \
                or vars(action)['dest'] == arg:
            parser._remove_action(action)

    for action in parser._action_groups:
        vars_action = vars(action)
        var_group_actions = vars_action['_group_actions']
        for x in var_group_actions:
            if x.dest == arg:
                var_group_actions.remove(x)
                return