Python click 模块，Tuple() 实例源码

def init():
    """Return top level command handler"""

    @click.command()
    @click.option('--cell', required=True,
                  envvar='TREADMILL_CELL',
                  callback=cli.handle_context_opt,
                  expose_value=False)
    @click.option('--monitor', nargs=2, type=click.Tuple([str, int]),
                  multiple=True, required=True)
    @click.option('--once', help='Run once.', is_flag=True, default=False)
    @click.option('--interval', help='Wait interval between checks.',
                  default=_DEFAULT_INTERVAL)
    @click.argument('name')
    def controller(monitor, once, interval, name):
        """Control app monitors across cells"""
        monitors = list(monitor)

        while True:

            intended_total = 0
            actual_total = 0
            intended = 0

            for cellname, count in monitors:
                if cellname == context.GLOBAL.cell:
                    intended = count
                else:
                    actual = _count(cellname, name)

                    _LOGGER.info('state for cell %s, actual: %s, intended: %s',
                                 cellname, actual, count)

                    intended_total += count
                    actual_total += actual

            missing = intended_total - actual_total

            # If there are missing instances, start them locally. If there are
            # extra instances (missing < 0) just keep the indended state for
            # the cell.
            my_count = intended + max(0, missing)
            _LOGGER.info('intended: %s, actual: %s, missing: %s, my count: %s',
                         intended_total, actual_total, missing, my_count)

            _configure_monitor(name, my_count)

            if once:
                break

            time.sleep(utils.to_seconds(interval))

    return controller

def __init__(self, name, app):
        """
        Init command
        :param name:    Name of the command
        :type name:     str
        :param app:     The application
        :type app:      edmunds.application.Application
        """
        super(TestCommand, self).__init__(name, app)

        # Fetch nose options
        config = Config(env=os.environ, files=all_config_files(), plugins=DefaultPluginManager())
        nose_options = config.getParser(doc=TestProgram.usage()).option_list

        # Override run-function to be able to load the click-options dynamically
        # Dynamic click.option does not work for class-methods because of __click_params__
        original_function = self.run
        def run_wrapper(**kwargs):
            return original_function(**kwargs)
        self.run = run_wrapper

        # Don't show --help
        nose_options = filter(lambda nose_option: '--help' not in nose_option._long_opts, nose_options)
        for nose_option in nose_options:
            args = nose_option._short_opts + nose_option._long_opts
            if not args:
                continue

            type_mapping = {
                'string': str,
                'int': int,
                'long': int,
                'float': float,
                # 'complex': str,
                # 'choice': str,
            }
            unsupported_attr = ['action', 'dest', 'const']

            kwargs = {}
            for attr in OptParseOption.ATTRS:
                if attr in unsupported_attr:
                    continue
                attr_value = getattr(nose_option, attr)
                if attr_value is None:
                    continue

                if attr == 'type':
                    attr_value = type_mapping[attr_value]
                    if nose_option.nargs > 1:
                        attr_value = click.Tuple([attr_value])
                if attr == 'default':
                    if attr_value == optparse.NO_DEFAULT:
                        continue

                kwargs[attr] = attr_value

            click.option(*args[:2], **kwargs)(run_wrapper)