埃特巴什码(Atbash)

# write by 2021/7/4
DIC_LOWER = "abcdefghijklmnopqrstuvwxyz"
DIC_UPPER = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
DIC_LOWER_RE = DIC_LOWER[::-1]
DIC_UPPER_RE = DIC_UPPER[::-1]
def encrypt_atbash(string):
    ciphertext = ""
    for i in string:
        if i in DIC_LOWER:
            ciphertext += DIC_LOWER_RE[DIC_LOWER.index(i)]
        elif i in DIC_UPPER:
            ciphertext += DIC_UPPER_RE[DIC_UPPER.index(i)]
        else:
            ciphertext += i
    return ciphertext
def decrypt_atbash(string):
    plaintext = ""
    for i in string:
        if i in DIC_LOWER_RE:
            plaintext += DIC_LOWER[DIC_LOWER_RE.index(i)]
        elif i in DIC_UPPER:
            plaintext += DIC_UPPER[DIC_UPPER_RE.index(i)]
        else:
            plaintext += i
    return plaintext
if __name__ == '__main__':
    ciphertext_ = encrypt_atbash("HaHa")
    plaintext_ = decrypt_atbash(ciphertext_)
    print(f"{plaintext_}: {ciphertext_}")