MeCabで日本語の回文判定

palindromejp.py

# -*- coding: utf-8 -*-
import MeCab

mecab_y = MeCab.Tagger("-Oyomi")


def toYomi(text):
    return mecab_y.parse(text).rstrip().replace(' ', '')


def normalize(text):
    text = text.replace('ファ', 'ハ')
    text = text.replace('フォ', 'ホ')
    text = text.replace('ヲ', 'オ')
    text = text.replace('アー', 'アア')
    text = text.replace('イー', 'イイ')
    text = text.replace('ウー', 'ウウ')
    text = text.replace('エー', 'エエ')
    text = text.replace('オー', 'オオ')
    return text

def is_palindrome(text):
    yomi = toYomi(text)
    yomi = normalize(yomi)

    length = len(yomi)
    if length < 2:  # 2文字以下は回文
        return True
    elif length % 2 == 0:
        return yomi[:length/2] == yomi[:length/2-1:-1]
    return yomi[:length/2] == yomi[:length/2:-1]


if __name__ == '__main__':
    while True:
        print is_palindrome(input('>').decode('utf8', 'replace'))