How to use the argcomplete.compat.str function in argcomplete

def _convert(self, choice):
        if isinstance(choice, bytes):
            choice = choice.decode(sys_encoding)
        if not isinstance(choice, str):
            choice = str(choice)
        return choice

active_parsers = self._patch_argument_parser()

        parsed_args = argparse.Namespace()
        self.completing = True

        if USING_PYTHON2:
            # Python 2 argparse only properly works with byte strings.
            comp_words = [ensure_bytes(word) for word in comp_words]

        try:
            debug("invoking parser with", comp_words[1:])
            with mute_stderr():
                a = self._parser.parse_known_args(comp_words[1:], namespace=parsed_args)
            debug("parsed args:", a)
        except BaseException as e:
            debug("\nexception", type(e), str(e), "while parsing args")

        self.completing = False

        if "--" in comp_words:
            self.always_complete_options = False

        completions = self.collect_completions(active_parsers, parsed_args, cword_prefix, debug)
        completions = self.filter_completions(completions)
        completions = self.quote_completions(completions, cword_prequote, last_wordbreak_pos)
        return completions

def _convert(self, choice):
        if isinstance(choice, bytes):
            choice = choice.decode(sys_encoding)
        if not isinstance(choice, str):
            choice = str(choice)
        return choice

def __init__(self, allowednames=(), directories=True):
        # Fix if someone passes in a string instead of a list
        if isinstance(allowednames, (str, bytes)):
            allowednames = [allowednames]

        self.allowednames = [x.lstrip("*").lstrip(".") for x in allowednames]
        self.directories = directories

def split_word(word):
        # TODO: make this less ugly
        point_in_word = len(word) + point - lexer.instream.tell()
        if isinstance(lexer.state, (str, bytes)) and lexer.state in lexer.whitespace:
            point_in_word += 1
        if point_in_word > len(word):
            debug("In trailing whitespace")
            words.append(word)
            word = ""
        prefix, suffix = word[:point_in_word], word[point_in_word:]
        prequote = ""
        # posix
        if lexer.state is not None and lexer.state in lexer.quotes:
            prequote = lexer.state
        # non-posix
        # if len(prefix) > 0 and prefix[0] in lexer.quotes:
        #    prequote, prefix = prefix[0], prefix[1:]

        return prequote, prefix, suffix, words, lexer.last_wordbreak_pos