How to use the gtts.tts.Speed function in gTTS

try:
                langs = tts_langs()
                if lang.lower() not in langs:
                    raise ValueError("Language not supported: %s" % lang)
            except RuntimeError as e:
                log.debug(str(e), exc_info=True)
                log.warning(str(e))

        self.lang_check = lang_check
        self.lang = lang.lower()

        # Read speed
        if slow:
            self.speed = Speed.SLOW
        else:
            self.speed = Speed.NORMAL

        # Pre-processors and tokenizer
        self.pre_processor_funcs = pre_processor_funcs
        self.tokenizer_func = tokenizer_func

        # Google Translate token
        self.token = gtts_token.Token()

# Language
        if lang_check:
            try:
                langs = gtts.tts.tts_langs()
                if lang.lower() not in langs:
                    raise ValueError("Language not supported: %s" % lang)
            except RuntimeError:
                pass

        self.lang_check = lang_check
        self.lang = lang.lower()

        # Read speed
        if slow:
            self.speed = gtts.tts.Speed.SLOW
        else:
            self.speed = gtts.tts.Speed.NORMAL

        # Pre-processors and tokenizer
        self.pre_processor_funcs = pre_processor_funcs
        self.tokenizer_func = tokenizer_func

        # Google Translate token
        self.token = _Token()

# Language
        if lang_check:
            try:
                langs = tts_langs()
                if lang.lower() not in langs:
                    raise ValueError("Language not supported: %s" % lang)
            except RuntimeError as e:
                log.debug(str(e), exc_info=True)
                log.warning(str(e))

        self.lang_check = lang_check
        self.lang = lang.lower()

        # Read speed
        if slow:
            self.speed = Speed.SLOW
        else:
            self.speed = Speed.NORMAL

        # Pre-processors and tokenizer
        self.pre_processor_funcs = pre_processor_funcs
        self.tokenizer_func = tokenizer_func

        # Google Translate token
        self.token = gtts_token.Token()

if lang_check:
            try:
                langs = gtts.tts.tts_langs()
                if lang.lower() not in langs:
                    raise ValueError("Language not supported: %s" % lang)
            except RuntimeError:
                pass

        self.lang_check = lang_check
        self.lang = lang.lower()

        # Read speed
        if slow:
            self.speed = gtts.tts.Speed.SLOW
        else:
            self.speed = gtts.tts.Speed.NORMAL

        # Pre-processors and tokenizer
        self.pre_processor_funcs = pre_processor_funcs
        self.tokenizer_func = tokenizer_func

        # Google Translate token
        self.token = _Token()