A Byte of Python 之 迴文

迴文即順著讀和倒著讀都一樣的字串。
建立檔案palindrome.py，敲入如下代碼：

#設定需要過慮的標點符號forbidden = (".", "?", "!", ":", ";", "-", "—", "()", "[]", "...", "'", '""', "/", ",", " ")#擷取一個字串，書中要求確認"Rise to vote, sir."是迴文text = input("請輸入：")#將字串倒過來def reverse(text):str_tmp = []str = ""for i in range(0,len(text)):if text[i] in forbidden:continueelse:str_tmp.append(text[i].lower())#方便比較，將字母轉成小寫字母return str.join(str_tmp)[::-1]#做是否是迴文檢測def is_palindrome(text):str_tmp = []str = ""for i in range(0,len(text)):if text[i] in forbidden:continueelse:str_tmp.append(text[i].lower())return str.join(str_tmp) == reverse(text)#輸出檢測結果if is_palindrome(text):print(text, "是迴文")else:print(text, "不是迴文")

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