python 调用阿里云语音合成TTS

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import hashlib
import requests
import hmac
import base64
import datetime
import tempfile
import shutil,os


class aliyun:


    def __init__(self):
        self.__aliyun_id = ""  # 个人用户 id
        self.__aliyun_secret = ""  # 个人用户 secret


    def __time(self):
        time = datetime.datetime.strftime(datetime.datetime.utcnow(), "%a, %d %b %Y %H:%M:%S GMT")
        return date


    def __md5_base64(self, body):
        hash = hashlib.md5()
        hash.update(body)
        str_hex = hash.digest()
        return base64.b64encode(str_hex)


    def __sha1_base64(self, str_to_sign, secret):
        hmacsha1 = hmac.new(secret.encode('utf-8'), str_to_sign.encode('utf-8'), hashlib.sha1)