How to use the argcomplete.compat.USING_PYTHON2 function in argcomplete

def debug(*args):
    if _DEBUG:
        if USING_PYTHON2:
            # debug_stream has to be binary mode in Python 2.
            # Attempting to write unicode directly uses the default ascii conversion.
            # Convert any unicode to bytes, leaving non-string input alone.
            args = [ensure_bytes(x) if isinstance(x, str) else x for x in args]
        print(file=debug_stream, *args)

def get_parsed_args(self, comp_words):
        """ gets the parsed args from a patched parser """
        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:
            active_parsers[0].parse_known_args(comp_words, namespace=parsed_args)
        except BaseException:  # pylint: disable=broad-except
            pass

        self.completing = False
        return parsed_args

def get_parsed_args(self, comp_words):
        """ gets the parsed args from a patched parser """
        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:
            active_parsers[0].parse_known_args(comp_words, namespace=parsed_args)
        except BaseException:
            pass

        self.completing = False
        return parsed_args

def get_parsed_args(self, comp_words):
        """ gets the parsed args from a patched parser """
        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:
            stderr = sys.stderr
            sys.stderr = os.open(os.devnull, "w")

            active_parsers[0].parse_known_args(comp_words, namespace=parsed_args)

            sys.stderr.close()
            sys.stderr = stderr
        except BaseException:
            pass

        self.completing = False
        return parsed_args