如何对字符串进行码表替换转码--加密encode

# encoding:utf-8
import base64
from string import maketrans

OLD_STR = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
NEW_STR = "vSoajc7dRzpWifGyNxZnV5k+DH"


def encode_demo(str_data):
    str_data = base64.b64encode(str_data)
    encode_tab = maketrans(OLD_STR, NEW_STR)
    return str_data.translate(encode_tab)


def decode_demo(str_date):
    decode_tab = maketrans(NEW_STR, OLD_STR)
    str_date = str_date.translate(decode_tab)
    return base64.b64decode(str_date)