How to use the langdetect.utils.unicode_block.unicode_block function in langdetect

def cleaning_text(self):
        '''Cleaning text to detect
        (eliminate URL, e-mail address and Latin sentence if it is not written in Latin alphabet).
        '''
        latin_count, non_latin_count = 0, 0
        for ch in self.text:
            if 'A' <= ch <= 'z':
                latin_count += 1
            elif ch >= six.u('\u0300') and unicode_block(ch) != 'Latin Extended Additional':
                non_latin_count += 1

        if latin_count * 2 < non_latin_count:
            text_without_latin = ''
            for ch in self.text:
                if ch < 'A' or 'z' < ch:
                    text_without_latin += ch
            self.text = text_without_latin

def normalize(cls, ch):
        block = unicode_block(ch)
        if block == UNICODE_BASIC_LATIN:
            if ch < 'A' or ('Z' < ch < 'a') or 'z' < ch:
                ch = ' '
        elif block == UNICODE_LATIN_1_SUPPLEMENT:
            if cls.LATIN1_EXCLUDED.find(ch) >= 0:
                ch = ' '
        elif block == UNICODE_LATIN_EXTENDED_B:
            # normalization for Romanian
            if ch == six.u('\u0219'):  # Small S with comma below => with cedilla
                ch = six.u('\u015f')
            if ch == six.u('\u021b'):  # Small T with comma below => with cedilla
                ch = six.u('\u0163')
        elif block == UNICODE_GENERAL_PUNCTUATION:
            ch = ' '
        elif block == UNICODE_ARABIC:
            if ch == six.u('\u06cc'):