Converts (transliterates) greek letters to latin equivalents.

def latinize(value):
    """
    Converts (transliterates) greek letters to latin equivalents.
    """
    def replace_double_character(match):
        search = ('Θ Χ Ψ '
                  'θ χ ψ '
                  'ΟΥ ΑΥ ΕΥ '
                  'Ου Αυ Ευ '
                  'ου αυ ευ').split()
        replace = ('TH CH PS '
                   'th ch ps '
                   'OU AU EU '
                   'Ou Au Eu '
                   'ou au eu').split()
        matched = match.group(0)
        if matched in search:
            return replace[search.index(matched)]
        return matched

    search = 'ΑΒΓΔΕΖΗΙΚΛΜΝΞΟΠΡΣΣΤΥΦΩαβγδεζηικλμνξοπρσςτυφω'
    replace = 'AVGDEZIIKLMNXOPRSSTUFOavgdeziiklmnxoprsstyfo'

    def replace_greek_character(match):
        matched = list(match.group(0))
        value = map(lambda l: replace[search.find(l)], matched)
        return ''.join(value)

    return re.sub(r'[{0}]+'.format(search),
                  replace_greek_character, re.sub(
        r'([ΘΧΨθχψ]+|ΟΥ|ΑΥ|ΕΥ|Ου|Αυ|Ευ|ου|αυ|ευ)',
        replace_double_character,
        remove_accents(value)))