def execute(self):
        parser = shell.CmdlineParser(self.cmdline_options)
        options = parser.parse()
        install_method = options['method']

        if self.SUPPORTED_METHODS not in install_method:
            error = "Chef pack doesn't support the given "\
                    "installation method: {}\n".format(install_method)
            sys.stderr.write(error)
            sys.exit(1)

        del options['method']
        self.install(install_method, options)
dataset/ETHPy150Open StackStorm/st2contrib/packs/chef/actions/chef_install.py/ChefInstaller.execute/swapped operands of `not in`