rot13加密解密

rot13加密解密小工具，python代码

def Upper(ch):if ch>='A' and ch<='Z':return Truedef Lower(ch):if ch>='a' and ch<='z':return Truedef rot13(s):flag = ''for i in s:if Upper(i) == True:if i>='A' and i<='M':flag += chr(ord(i)+13)else:flag += chr(ord(i)-13)elif Lower(i) == True:if i>='a' and i<='m':flag += chr(ord(i)+13)else:flag += chr(ord(i)-13)else:flag += ireturn flagif __name__ == "__main__":s = 'synt{mur_VF_syn9_svtug1at}'print rot13(s)