def initialize(<EOL>self, region="<STR_LIT>", host=None, port=<NUM_LIT>, config_dir=None, session=None<EOL>):
try:<EOL><INDENT>import readline<EOL>import rlcompleter<EOL><DEDENT>except ImportError:<EOL><INDENT>pass<EOL><DEDENT>else:<EOL><INDENT>if "<STR_LIT>" in readline.__doc__:<EOL><INDENT>readline.parse_and_bind("<STR_LIT>")<EOL><DEDENT>else:<EOL><INDENT>readline.parse_and_bind("<STR_LIT>")<EOL><DEDENT>delims = set(readline.get_completer_delims())<EOL>if "<STR_LIT:->" in delims:<EOL><INDENT>delims.remove("<STR_LIT:->")<EOL>readline.set_completer_delims("<STR_LIT>".join(delims))<EOL><DEDENT><DEDENT>self._conf_dir = config_dir or os.path.join(<EOL>os.environ.get("<STR_LIT>", "<STR_LIT:.>"), "<STR_LIT>"<EOL>)<EOL>self.session = session or botocore.session.get_session()<EOL>self.engine = FragmentEngine()<EOL>self.engine.caution_callback = self.caution_callback<EOL>if host is not None:<EOL><INDENT>self._local_endpoint = (host, port)<EOL><DEDENT>self.engine.connect(<EOL>region, session=self.session, host=host, port=port, is_secure=(host is None)<EOL>)<EOL>self.conf = self.load_config()<EOL>for key, value in iteritems(DEFAULT_CONFIG):<EOL><INDENT>self.conf.setdefault(key, value)<EOL><DEDENT>self.display = DISPLAYS[self.conf["<STR_LIT>"]]<EOL>self.throttle = TableLimits()<EOL>self.throttle.load(self.conf["<STR_LIT>"])<EOL>
Set up the repl for execution.