argparse.py 文件源码

def _person_opts(person, short):
    """Sets options.<person> to a function that modifies a Person
    according to the commandline options."""
    def short_callback(option, opt_str, value, parser, field):
        f = getattr(parser.values, person)
        if field == "date":
            value = git.Date(value)
        setattr(parser.values, person,
                lambda p: getattr(f(p), 'set_' + field)(value))
    def full_callback(option, opt_str, value, parser):
        ne = utils.parse_name_email(value)
        if not ne:
            raise optparse.OptionValueError(
                'Bad %s specification: %r' % (opt_str, value))
        name, email = ne
        short_callback(option, opt_str, name, parser, 'name')
        short_callback(option, opt_str, email, parser, 'email')
    return (
        [opt('--%s' % person, metavar = '"NAME <EMAIL>"', type = 'string',
             action = 'callback', callback = full_callback, dest = person,
             default = lambda p: p, short = 'Set the %s details' % person)] +
        [opt('--%s%s' % (short, f), metavar = f.upper(), type = 'string',
             action = 'callback', callback = short_callback, dest = person,
             callback_args = (f,), short = 'Set the %s %s' % (person, f))
         for f in ['name', 'email', 'date']])